Control ESP32 with BT Remote - Subscribe to Characteristic by Handle for notification of button presses #1050

JBHudston · 2025-10-17T10:57:04Z

JBHudston
Oct 17, 2025

Hi all,
I'm way out of my depth but thick I'm so close to getting this to work.
I want to control a ESP WROOM 32 with a FireTV BLE remote.
I've used Wireshark to read a debug log from my phone and also used nRF Connect to try to work out the UUIDs, Services, Characteristics and Handles used. I believe the phone connects to the remote then writes "0100" to Characteristics with Handles:

0x005f
0x0063
0x0067
0x006b
0x0078

185	7.084661	remote ()	SamsungElect_16:48:0d (No name's A23)	ATT	504	Rcvd Read Request, Handle: 0x10ff (Unknown)
934	2355.190185	remote ()	SamsungElect_16:48:0d (No name's A23)	ATT	485	Rcvd Read Request, Handle: 0x20ff (Unknown)
1458	2421.302372	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	16	Sent Read By Type Request, PnP ID, Handles: 0x0001..0xffff
1492	2421.473841	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Exchange MTU Request, Client Rx MTU: 251
1493	2421.474550	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1494	2421.475452	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	20	Rcvd Read By Type Response, Attribute List Length: 1
1496	2421.476847	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Exchange MTU Response, Server Rx MTU: 517
1498	2421.477903	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	16	Sent Read By Type Request, Server Supported Features, Handles: 0x0001..0xffff
1506	2421.563789	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	14	Rcvd Error Response - Attribute Not Found, Handle: 0x0001 (Unknown)
1507	2421.565025	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0054 (Unknown)
1509	2421.654346	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	14	Rcvd Read Response, Handle: 0x0054 (Unknown)
1510	2421.655665	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0056 (Unknown)
1513	2421.746137	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	159	Rcvd Read Response, Handle: 0x0056 (Unknown)
1514	2421.747587	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0057 (Unknown)
1516	2421.844368	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0057 (Unknown)
1518	2421.845865	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0060 (Unknown)
1521	2421.923822	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0060 (Unknown)
1522	2421.925756	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0064 (Unknown)
1524	2421.965344	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0064 (Unknown)
1526	2421.967069	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0068 (Unknown)
1528	2422.004616	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0068 (Unknown)
1529	2422.006107	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x006c (Unknown)
1531	2422.043822	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x006c (Unknown)
1532	2422.046036	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x006f (Unknown)
1534	2422.083748	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x006f (Unknown)
1535	2422.085040	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0072 (Unknown)
1537	2422.123734	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0072 (Unknown)
1538	2422.125090	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0075 (Unknown)
1544	2422.163954	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0075 (Unknown)
1548	2422.165641	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x0079 (Unknown)
1551	2422.204186	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	12	Rcvd Read Response, Handle: 0x0079 (Unknown)
1552	2422.206027	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	12	Sent Read Request, Handle: 0x001a (Unknown)
1554	2422.244418	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	18	Rcvd Read Response, Handle: 0x001a (Unknown)
1556	2422.247474	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	14	Sent Write Request, Handle: 0x005f (Unknown)
1560	2422.324143	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	10	Rcvd Write Response, Handle: 0x005f (Unknown)
1561	2422.326087	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	14	Sent Write Request, Handle: 0x0063 (Unknown)
1563	2422.364068	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	10	Rcvd Write Response, Handle: 0x0063 (Unknown)
1564	2422.365788	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	14	Sent Write Request, Handle: 0x0067 (Unknown)
1566	2422.406606	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	10	Rcvd Write Response, Handle: 0x0067 (Unknown)
1568	2422.408355	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	14	Sent Write Request, Handle: 0x006b (Unknown)
1570	2422.443864	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	10	Rcvd Write Response, Handle: 0x006b (Unknown)
1571	2422.445540	SamsungElect_16:48:0d (No name's A23)	AmazonTechno_b5:1e:f3 ()	ATT	14	Sent Write Request, Handle: 0x0078 (Unknown)
1573	2422.484894	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	10	Rcvd Write Response, Handle: 0x0078 (Unknown)
1575	2424.443325	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1582	2424.750578	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1584	2424.845895	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1586	2424.924411	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1602	2425.044378	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1603	2425.126690	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1604	2425.266068	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1606	2425.344156	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1607	2425.465907	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1615	2425.545241	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1616	2425.666776	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1618	2425.747408	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1620	2425.868765	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1621	2425.948367	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1622	2426.067545	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1625	2426.170517	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1627	2426.286265	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1629	2426.367445	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1630	2426.508969	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1632	2427.657306	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1640	2427.727578	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1642	2427.826260	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1643	2427.905846	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1644	2427.989269	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1646	2428.105656	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1647	2428.188953	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1649	2428.285375	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1650	2428.390842	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1654	2428.487121	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1655	2428.567472	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1657	2428.665765	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1659	2428.767026	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1661	2428.871661	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1663	2428.945241	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1664	2429.087157	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1666	2429.148598	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1667	2429.249498	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1669	2429.328263	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1670	2429.467989	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1672	2429.527399	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1673	2429.649784	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1675	2429.745788	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1676	2429.865973	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1677	2429.950247	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1679	2430.047894	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1680	2430.130372	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1682	2430.245796	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1683	2430.350462	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1685	2430.489678	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	15	Rcvd Handle Value Notification, Handle: 0x005e (Unknown)
1687	2431.216242	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1691	2431.304713	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1692	2431.384312	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1693	2431.506499	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1696	2431.584179	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1697	2431.686536	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1699	2431.826028	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1703	2431.946742	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1704	2432.027863	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1705	2432.166925	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1708	2432.245663	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1709	2432.387681	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1711	2432.465983	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1712	2432.589535	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1714	2432.687410	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1715	2432.810115	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1718	2432.905414	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1719	2433.028675	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1721	2433.127553	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1722	2433.252034	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1724	2433.349503	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1725	2433.467935	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1727	2433.569557	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1729	2433.688913	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1730	2433.786646	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1731	2433.908178	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1733	2434.005363	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1734	2434.125731	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1736	2434.206055	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)
1737	2434.327675	AmazonTechno_b5:1e:f3 ()	SamsungElect_16:48:0d (No name's A23)	ATT	16	Rcvd Handle Value Notification, Handle: 0x0062 (Unknown)

Then setup Armbian on my T95Z Plus TV box to connect to the remote and try to work out the button presses with btmon and gatttool:

root@aml-s9xx-box:~# gatttool -I
[                 ][LE]> connect 08:57:FB:B5:1E:F3
Attempting to connect to 08:57:FB:B5:1E:F3
Error: connect to 08:57:FB:B5:1E:F3: Device or resource busy (16)
[08:57:FB:B5:1E:F3][LE]> connect 08:57:FB:B5:1E:F3
Attempting to connect to 08:57:FB:B5:1E:F3
Connection successful
[08:57:FB:B5:1E:F3][LE]>
(gatttool:9668): GLib-WARNING **: 10:50:12.245: Invalid file descriptor.
[08:57:FB:B5:1E:F3][LE]> primary
Command Failed: Disconnected
[08:57:FB:B5:1E:F3][LE]> primary
Command Failed: Disconnected
[08:57:FB:B5:1E:F3][LE]> connect 08:57:FB:B5:1E:F3
Attempting to connect to 08:57:FB:B5:1E:F3
Connection successful
[08:57:FB:B5:1E:F3][LE]> primary
attr handle: 0x0001, end grp handle: 0x0001 uuid: 00001801-0000-1000-8000-00805f9b34fb
attr handle: 0x0014, end grp handle: 0x001a uuid: 00001800-0000-1000-8000-00805f9b34fb
attr handle: 0x0028, end grp handle: 0x0038 uuid: 0000180a-0000-1000-8000-00805f9b34fb
attr handle: 0x0040, end grp handle: 0x0044 uuid: 0000180f-0000-1000-8000-00805f9b34fb
attr handle: 0x004a, end grp handle: 0x004c uuid: 00001813-0000-1000-8000-00805f9b34fb
attr handle: 0x004f, end grp handle: 0x0079 uuid: 00001812-0000-1000-8000-00805f9b34fb
attr handle: 0xfda2, end grp handle: 0xfdaa uuid: 5de20000-5e8d-11e6-8b77-86f30ca893d3
attr handle: 0xfe02, end grp handle: 0xfe0d uuid: cfbfa000-762c-4912-a043-20e3ecde0a2d
[08:57:FB:B5:1E:F3][LE]> primary 1812
Starting handle: 0x004f Ending handle: 0x0079
[08:57:FB:B5:1E:F3][LE]>
[08:57:FB:B5:1E:F3][LE]> characteristics 4f 79
handle: 0x0051, char properties: 0x04, char value handle: 0x0052, uuid: 00002a4c-0000-1000-8000-00805f9b34fb
handle: 0x0053, char properties: 0x02, char value handle: 0x0054, uuid: 00002a4a-0000-1000-8000-00805f9b34fb
handle: 0x0055, char properties: 0x02, char value handle: 0x0056, uuid: 00002a4b-0000-1000-8000-00805f9b34fb
handle: 0x005d, char properties: 0x12, char value handle: 0x005e, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0061, char properties: 0x12, char value handle: 0x0062, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0065, char properties: 0x12, char value handle: 0x0066, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0069, char properties: 0x12, char value handle: 0x006a, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x006d, char properties: 0x0a, char value handle: 0x006e, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0070, char properties: 0x0a, char value handle: 0x0071, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0073, char properties: 0x0a, char value handle: 0x0074, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
handle: 0x0076, char properties: 0x12, char value handle: 0x0077, uuid: 00002a4d-0000-1000-8000-00805f9b34fb
[08:57:FB:B5:1E:F3][LE]>
(gatttool:9668): GLib-WARNING **: 11:29:10.442: Invalid file descriptor.

All the previous mentioned Handles have the same UUID "00002a4d-0000-1000-8000-00805f9b34fb".

root@aml-s9xx-box:~# btmon
Bluetooth monitor ver 5.79
btmon[9558]: = Note: Linux version 6.16.11-edge-meson64 (aarch64)                                           0.690375
btmon[9558]: = Note: Bluetooth subsystem version 2.22                                                       0.690392
= New Index: AA:AA:AA:AA:AA:AA (Primary,UART,hci0)                                                   [hci0] 0.690399
= Open Index: AA:AA:AA:AA:AA:AA                                                                      [hci0] 0.690403
= Index Info: AA:AA:AA:AA:AA:AA (Broadcom Corporation)                                               [hci0] 0.690407
bluetoothd[1743]: @ MGMT Open: bluetoothd (privileged) version 1.23                                {0x0001} 0.690414
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #1 [hci0] 10.984188
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 510000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #2 [hci0] 11.103595
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #3 [hci0] 15.503650
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 520000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #4 [hci0] 15.603644
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #5 [hci0] 17.943664
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 520000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #6 [hci0] 18.123698
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #7 [hci0] 18.823689
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 4f0000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #8 [hci0] 19.003716
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                      #9 [hci0] 20.504319
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 500000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                     #10 [hci0] 20.563724
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                     #11 [hci0] 21.863717
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 500000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                     #12 [hci0] 23.163745
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> HCI Event: Authenticated Payload Timeout Expired (0x57) plen 2                                #13 [hci0] 53.183500
        Handle: 64
> HCI Event: Authenticated Payload Timeout Expired (0x57) plen 2                                #14 [hci0] 84.283905
        Handle: 64
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                     #15 [hci0] 94.185249
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 580000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                     #16 [hci0] 94.264640
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                     #17 [hci0] 98.344717
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 21020000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                     #18 [hci0] 98.444737
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #19 [hci0] 108.484865
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 40000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #20 [hci0] 108.524862
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #21 [hci0] 109.844876
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 23020000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #22 [hci0] 109.964870
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                    #23 [hci0] 110.904841
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: f10000
> ACL Data RX: Handle 64 flags 0x02 dlen 10                                                    #24 [hci0] 111.044851
      ATT: Handle Value Notification (0x1b) len 5
        Handle: 0x005e
          Data[3]: 000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #25 [hci0] 112.265493
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: b4000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #26 [hci0] 112.324900
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #27 [hci0] 112.984907
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: cd000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #28 [hci0] 113.124910
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #29 [hci0] 113.644927
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: b3000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #30 [hci0] 113.804928
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #31 [hci0] 114.324905
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 8d000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #32 [hci0] 114.484931
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #33 [hci0] 114.964928
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: e9000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #34 [hci0] 115.124969
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #35 [hci0] 115.604942
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: e2000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #36 [hci0] 115.744915
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #37 [hci0] 117.725546
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: ea000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #38 [hci0] 117.784984
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0062
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #39 [hci0] 119.784963
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: a2000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #40 [hci0] 119.945015
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #41 [hci0] 121.785615
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: a1000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #42 [hci0] 121.845017
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #43 [hci0] 122.325027
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: a3000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #44 [hci0] 122.465010
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: 00000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #45 [hci0] 122.905010
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: a4000000
> ACL Data RX: Handle 64 flags 0x02 dlen 11                                                    #46 [hci0] 123.065045
      ATT: Handle Value Notification (0x1b) len 6
        Handle: 0x0077
          Data[4]: 00000000
> HCI Event: Authenticated Payload Timeout Expired (0x57) plen 2                               #47 [hci0] 153.084728
        Handle: 64

I've used example NimBLE_Client.ino and copied the Service and Characteristic UUIDs in here:

/** Define a class to handle the callbacks when scan events are received */
class ScanCallbacks : public NimBLEScanCallbacks {
    void onResult(const NimBLEAdvertisedDevice* advertisedDevice) override {
        Serial.printf("Advertised Device found: %s\n", advertisedDevice->toString().c_str());
        if (advertisedDevice->isAdvertisingService(NimBLEUUID("00001812-0000-1000-8000-00805f9b34fb"))) {
            Serial.printf("Found Our Service\n");
            /** stop scan before connecting */
            NimBLEDevice::getScan()->stop();
            /** Save the device reference in a global for the client to use*/
            advDevice = advertisedDevice;
            /** Ready to connect now */
            doConnect = true;
        }
    }

    /** Now we can read/write/subscribe the characteristics of the services we are interested in */
    NimBLERemoteService*        pSvc = nullptr;
    NimBLERemoteCharacteristic* pChr = nullptr;
    NimBLERemoteDescriptor*     pDsc = nullptr;

    pSvc = pClient->getService("00001812-0000-1000-8000-00805f9b34fb");
    if (pSvc) {
        pChr = pSvc->getCharacteristic("00002a4d-0000-1000-8000-00805f9b34fb");
        Serial.printf("%s Value: %s\n", pChr->getUUID().toString().c_str(), pChr->readValue().c_str());
        Characteristic_Value = pChr->readValue().c_str();

            if (pChr->canNotify()) {
                if (!pChr->subscribe(true, notifyCB)) {
                    Serial.print("Characteristic Subscribed?");
                    pClient->disconnect();
                    return false;
                }
            }


    }
    return true;
}

I've enabled debug in Arduino Tools>Core Debug Level>Debug and reflashed the ESP32:

I NimBLEDevice: BLE Host Task Started
I NimBLEDevice: NimBle host synced.
D NimBLEScan: >> start: duration=5000
D NimBLEScan: Scan started
D NimBLEScan: << start()
Scanning for peripherals
=========== After Setup Start ============
INTERNAL Memory Info:
------------------------------------------
I NimBLEScan: New advertiser: 30:c4:fb:98:9c:6b
D NimBLEScanCallbacks: Discovered: Name: , Address: 30:c4:fb:98:9c:6b
Service Data:
UUID: 0xfcf1, Data: �
I NimBLEScan: Scan response from: 30:c4:fb:98:9c:6b
Advertised Device found: Name: , Address: 30:c4:fb:98:9c:6b
Service Data:
UUID: 0xfcf1, Data: �
I NimBLEScan: New advertiser: 08:57:fb:b5:1e:f3
D NimBLEScanCallbacks: Discovered: Name: AR, Address: 08:57:fb:b5:1e:f3, appearance: 384, manufacturer data: 7101041e, serviceUUID: 0x1812
I NimBLEScan: Scan response from: 08:57:fb:b5:1e:f3
Advertised Device found: Name: AR, Address: 08:57:fb:b5:1e:f3, appearance: 384, manufacturer data: 7101041e, serviceUUID: 0x1812
Found Our Service
D NimBLEScan: >> stop()
D NimBLEScan: << stop()
  Total Size        :   293804 B ( 286.9 KB)
  Free Bytes        :   215756 B ( 210.7 KB)
  Allocated Bytes   :    70900 B (  69.2 KB)
  Minimum Free Bytes:   215692 B ( 210.6 KB)
  Largest Free Block:   110580 B ( 108.0 KB)
------------------------------------------
GPIO Info:
------------------------------------------
  GPIO : BUS_TYPE[bus/unit][chan]
  --------------------------------------  
     1 : UART_TX[0]
     3 : UART_RX[0]
============ After Setup End =============
New client created
D NimBLEClient: >> connect(08:57:fb:b5:1e:f3)
D NimBLEClient: >> handleGapEvent BLE_GAP_EVENT_CONNECT 
D NimBLEClient: >> handleGapEvent BLE_GAP_EVENT_LINK_ESTAB
D NimBLEClient: >> handleGapEvent BLE_GAP_EVENT_DATA_LEN_CHG
D NimBLEClient: >> handleGapEvent BLE_GAP_EVENT_MTU
I NimBLEClient: mtu update: mtu=251
D NimBLEClientCallbacks: onMTUChange: default
CD NimBLEClient: << handleGapEvent
D NimBLEClient: exchangeMTUCb: status=0, mtu=251
onnected
D NimBLEClient: << connect()
Connected to: 08:57:fb:b5:1e:f3 RSSI: -38
D NimBLEClient: >> getService: uuid: 00001812-0000-1000-8000-00805f9b34fb
D NimBLEClient: Service Discovered >> status: 14 handle: -1
D NimBLEClient: << Service Discovered
D NimBLEClient: Service Discovered >> status: 0 handle: 79
D NimBLEClient: Service Discovered >> status: 14 handle: -1
D NimBLEClient: << Service Discovered
D NimBLERemoteService: >> getCharacteristic: uuid: 00002a4d-0000-1000-8000-00805f9b34fb
D NimBLERemoteService: >> retrieveCharacteristics()
D NimBLERemoteService: Characteristic Discovery >> status: 14 handle: -1
D NimBLERemoteService: << Characteristic Discovery
D NimBLERemoteService: << retrieveCharacteristics()
D NimBLERemoteService: >> retrieveCharacteristics()
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 93
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 97
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 101
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 105
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 109
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 112
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 115
D NimBLERemoteService: Characteristic Discovery >> status: 0 handle: 118
D NimBLERemoteService: Characteristic Discovery >> status: 14 handle: -1
D NimBLERemoteService: << Characteristic Discovery
D NimBLERemoteService: << retrieveCharacteristics()
D NimBLERemoteService: << Characteristic found
D NimBLERemoteValueAttribute: >> readValue()
I NimBLERemoteValueAttribute: Read complete; status=0
D NimBLERemoteValueAttribute: Got 4 bytes
I NimBLERemoteValueAttribute: Read complete; status=14
D NimBLERemoteValueAttribute: << readValue
0x2a4d Value: 
D NimBLERemoteValueAttribute: >> readValue()
I NimBLERemoteValueAttribute: Read complete; status=0
D NimBLERemoteValueAttribute: Got 4 bytes
I NimBLERemoteValueAttribute: Read complete; status=14
D NimBLERemoteValueAttribute: << readValue
D NimBLERemoteCharacteristic: >> setNotify()
D NimBLERemoteCharacteristic: >> getDescriptor: uuid: 0x2902
D NimBLERemoteCharacteristic: >> retrieveDescriptors() for characteristic: 0x2a4d
D NimBLERemoteCharacteristic: Descriptor Discovery >> status: 0 handle: 120
D NimBLERemoteCharacteristic: << Descriptor Discovery
D NimBLERemoteCharacteristic: << retrieveDescriptors(): found 1 descriptors.
D NimBLERemoteCharacteristic: << getDescriptor: found
D NimBLERemoteCharacteristic: << setNotify()
D NimBLERemoteValueAttribute: >> writeValue()
I NimBLERemoteValueAttribute: Write complete; status=0
D NimBLERemoteValueAttribute: << writeValue
Success! we should now be getting notifications, scanning for more!

Can someone please tell me if "!pChr->subscribe(true, notifyCB)" subscribes to the Characteristic (pChr = pSvc->getCharacteristic("00002a4d-0000-1000-8000-00805f9b34fb")) for all the handles for button press notifications or does it have to subscribe to each handle separately and if so how can this be done?

Appreciate any help as I've spent ages stabbing in the dark. :)

h2zero · 2025-10-20T20:14:39Z

h2zero
Oct 20, 2025
Maintainer

You've done well, unfortunately you've run into a missing API. There currently is not a way to differentiate between characteristics that have the same uuid and the library will just provide the first one found.

5 replies

JBHudston Oct 21, 2025
Author

Thanks for the reply @h2zero .
Is this the case just for NimBLE-Arduino? Is it possible with other libraries?
I found this issue here where I thought you had implemented getting characteristics by handle?

#127 (comment)

I think someone made the changes to the library to get it to work here?

#340 (comment)

If I know the handles of the characteristics can I specify these to subscribe to the notifications?
Or how do I iterate through all characteristics and subscribe to each one?

It seems to have been implemented here but using an old version of NimBLE that I can't get to compile and work.

#680 (comment)

h2zero Oct 28, 2025
Maintainer

~~I can write a quick function to get a characteristic by handle.~~
@JBHudston I just remembered that this function already exists, sorry.

NimBLE-Arduino/src/NimBLEClient.h

Line 87 in 7a4402f

NimBLERemoteCharacteristic* getCharacteristic(uint16_t handle);

Be sure to call discoverAttributes() first:

pClient->discoverAttributes();
auto pChr = pClient->getCharacteristic(<<<HANDLE>>>);

JBHudston Oct 29, 2025
Author

Oh excellent!
I can try it out till I'm back from holiday next week :(
Thanks

But will "subscribe" pass the handle to differentiate between the characteristics that have the same UUIDs?
Does "notifyCB" need changing at all?

if (pChr->canNotify()) {
               if (!pChr->subscribe(true, notifyCB)) {
                    pClient->disconnect();
                    return false;
                }

h2zero Oct 29, 2025
Maintainer

Subscribing to notifications will work the same, internally this all works by handles.

JBHudston Oct 29, 2025
Author

Great. Something to look forward to when I have to go home. :)

Uh oh!

Control ESP32 with BT Remote - Subscribe to Characteristic by Handle for notification of button presses #1050

Uh oh!

JBHudston Oct 17, 2025

Replies: 1 comment · 5 replies

Uh oh!

h2zero Oct 20, 2025 Maintainer

Uh oh!

Uh oh!

JBHudston Oct 21, 2025 Author

Uh oh!

Uh oh!

h2zero Oct 28, 2025 Maintainer

Uh oh!

Uh oh!

JBHudston Oct 29, 2025 Author

Uh oh!

h2zero Oct 29, 2025 Maintainer

Uh oh!

JBHudston Oct 29, 2025 Author

JBHudston
Oct 17, 2025

Replies: 1 comment 5 replies

h2zero
Oct 20, 2025
Maintainer

JBHudston Oct 21, 2025
Author

h2zero Oct 28, 2025
Maintainer

JBHudston Oct 29, 2025
Author

h2zero Oct 29, 2025
Maintainer

JBHudston Oct 29, 2025
Author