ESP-01 board (8266) and micropython version 1.26.1 installed to it.

[Mar2ku]

I have a problem to get working solution for "urequests.post(...)" command.
Program stops the error code "OSError: [Errno 107] ENOTCONN".

Program works finely with python3 on Linux computer.

Any ideas from where I might find a solution about that?

[scruss]

Have you verified that your ESP8266 is really connected to the wireless network?

Also, MicroPython's requests is a subset of CPython's. It's also running on a board with a fraction of the memory (and typically for a small flash ESP01, a very cut down set of libraries to fit into 1 MB)

[Mar2ku]

The board is connected to WLAN. It got an IP address and it's replying the ping.
My ESP board has 1MB memory. I will find the ESP board with 2 or 4 MB memory and will test requests.post with them.
Let's see what will be a result.

[robert-hh]

The only difference between the 1M and 2/4M boards is the flash size. The Python heap size is the same, which limits the size of Python code loaded to RAM. Only at the 4M boards you could put large amounts of Python code into flash as frozen byte code.

[shariltumin]

Are you trying HTTP or HTTPS? The ESP-01 may not have enough RAM for TLS.

[Mar2ku]

I'm trying HTTPS. My plan is to send a metric data to Grafana Cloud.

[shariltumin]

The ESP8266 MicroPython firmware uses AXTLS, which does not support the newer TLS versions. It's possible that the Grafana Cloud server you're trying to connect to does not support AXTLS connectivity.

You can try sending your raw data to your Linux PC using a simple socket. That PC can then send the data to the Grafana server. Alternatively, you can migrate your project to ESP32.

[Mar2ku]

Thanks for all of you that hints for programming ESP.
I tested a simple socket and unfortunately "sock.connect((host, port))" to end to "error 104".
I'm going to test next ESP-32 boards and I hope it working properly.

[Mar2ku]

Hi. I tested the ESP32 boards and "requests.post" is working properly. I will continue my project with ESP32 boards. Thanks for all of you about info of boards.