Wait for network to go offline before reconfiguring backup (#1453)

Signed-off-by: Chris Jackson <[email protected]>

Author: cdjackson

com.zsmartsystems.zigbee.dongle.ember/src/main/java/com/zsmartsystems/zigbee/dongle/ember/ZigBeeDongleEzsp.java

@@ -575,7 +575,6 @@ public ZigBeeStatus startup(boolean reinitialize) {
             ncp.sendManyToOneRouteRequest(concentratorType, radius);
         }
 
-        ncp.getConfiguration(EzspConfigId.EZSP_CONFIG_PACKET_BUFFER_COUNT);
         return joinedNetwork ? ZigBeeStatus.SUCCESS : ZigBeeStatus.BAD_RESPONSE;
     }
 
@@ -763,7 +762,27 @@ public ZigBeeStatus setNetworkState(ZigBeeNetworkState networkState) {
                 // token area once - subsequent writes will fail, and therefore changing IEEE address (eg from a
                 // backup/restore) may fail.
                 ncp.tokenFactoryReset(false, false);
-                return ncp.leaveNetwork() == EmberStatus.EMBER_SUCCESS ? ZigBeeStatus.SUCCESS : ZigBeeStatus.FAILURE;
+                if (ncp.leaveNetwork() != EmberStatus.EMBER_SUCCESS) {
+                    return ZigBeeStatus.FAILURE;
+                }
+
+                // Wait for the notification from the NCP that it is offline.
+                // This comes through the EzspStackStatusHandler which is processed elsewhere
+                // and sets networkStateUp to false
+                long timer = System.currentTimeMillis() + WAIT_FOR_ONLINE;
+                do {
+                    if (!networkStateUp) {
+                        return ZigBeeStatus.SUCCESS;
+                    }
+
+                    try {
+                        Thread.sleep(250);
+                    } catch (InterruptedException e) {
+                        break;
+                    }
+                } while (timer > System.currentTimeMillis());
+
+                return ZigBeeStatus.INVALID_STATE;
             case ONLINE:
                 return ncp.networkInit() == EmberStatus.EMBER_SUCCESS ? ZigBeeStatus.SUCCESS : ZigBeeStatus.FAILURE;
             default:

com.zsmartsystems.zigbee/src/main/java/com/zsmartsystems/zigbee/ZigBeeNetworkManager.java

@@ -2092,7 +2092,11 @@ public ZigBeeStatus restoreBackup(UUID uuid) {
         logger.debug("RestoreBackup: Backup read from {}", uuid);
 
         // Take the network offline for reconfiguration
-        transport.setNetworkState(ZigBeeNetworkState.UNINITIALISED);
+        ZigBeeStatus offlineResponse = transport.setNetworkState(ZigBeeNetworkState.UNINITIALISED);
+        if (offlineResponse != ZigBeeStatus.SUCCESS) {
+            logger.error("RestoreBackup: Failed to set network to UNINITIALISED with response {}", offlineResponse);
+            return ZigBeeStatus.INVALID_STATE;
+        }
 
         // To properly re-add nodes, we must be INITIALIZING
         // To call startup, we must be INITIALIZING