ENOMEM and tcp sockets?

[larsks]

I am running Micropython 1.9.3 (v1.9.3-8-g63826ac5c) on an esp8266 device.

Does micropython raise ENOMEM for reasons other than actually running out of memory? I'm trying to write a simple http server; you can see the code at https://gist.github.com/larsks/1cf5f8cd ... b93433cc32. It doesn't do anything right now other than parse an HTTP request and send a short one-line response.

I am consistently getting:

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Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "server.py", line 107, in <module>
  File "server.py", line 78, in serve
  File "server.py", line 74, in create_socket
OSError: [Errno 12] ENOMEM

Where line 74 is:

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        s.listen(1)

Am I doing something wrong here? Am I *actually* running out of memory? How can I check? After the ENOMEM exception, gc.mem_free() reports:

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>>> gc.mem_free()
24400

And esp.freemem() reports:

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>>> esp.freemem()
8632

[Roberthh]

You get that error if you have a socket open and the perform a warm boot (Ctrl_D) or try otherwise to re-uses these.. You have either to close the sockets or do a hard reset to release the sockets.

[larsks]

You get that error if you have a socket open and the perform a warm boot (Ctrl_D) or try otherwise to re-uses these.

That was it! I didn't realize that open sockets would persist over a soft reset like that.