ESP8266 Micropython: [Errno 103] ECONNABORTED\r\n') after some time - esp8266

Question

I am having issues running the following script for a longer period of time:
I use ampy to execute the script on the ESP:
sudo ampy --port /dev/ttyUSB0 run photoresistor.py
photoresistor.py:
#!/usr/bin/env python3
import machine
import network
from time import sleep
from urllib.urequest import urlopen
import json
wifiap = network.WLAN(network.AP_IF)
wifiap.active(False)
routercon = network.WLAN(network.STA_IF)
routercon.active(True)
routercon.ifconfig(('10.0.0.128','255.255.255.0','10.0.0.138','10.0.0.138'))
routercon.connect('mywifi', '123')
while not routercon.isconnected():
pass
posturl=('http://10.0.0.156:23102/rest/v2/send')
adc = machine.ADC(0)
gc.enable()
while True:
value = adc.read()
if value < 200:
message = {'username': 'test', 'message': value, 'chatid': 'test', 'password': 'test', 'notifyself': 'false'}
r = urlopen(posturl, data=json.dumps(message).encode())
r.close()
gc.collect()
sleep(1)
It works as expected in the beginning but after some time I get the following stacktrace:
Traceback (most recent call last):
File "/usr/local/bin/ampy", line 11, in <module>
sys.exit(cli())
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/ampy/cli.py", line 337, in run
output = board_files.run(local_file, not no_output)
File "/usr/local/lib/python3.6/dist-packages/ampy/files.py", line 303, in run
out = self._pyboard.execfile(filename)
File "/usr/local/lib/python3.6/dist-packages/ampy/pyboard.py", line 273, in execfile
return self.exec_(pyfile)
File "/usr/local/lib/python3.6/dist-packages/ampy/pyboard.py", line 267, in exec_
raise PyboardError('exception', ret, ret_err)
ampy.pyboard.PyboardError: ('exception', b'', b'Traceback (most recent call last):\r\n File "<stdin>", line 28, in <module>\r\n File "urequests.py", line 152, in post\r\n File "urequests.py", line 89, in request\r\nOSError: [Errno 103] ECONNABORTED\r\n')
No idea what to do.
I tried to play around with the garbage collection but it didn't help.
I suspect that the board doesn't clean up sockets properly.
If the board is sending post requests quickly in the loop (every second for 1 minute) and let it sit afterwards for a short period of time it fails quickly with above ECONNABORTED.
If the board sends post requests more slowly (like 2 in a minute) it takes way longer for it to fail. To conclude: I suspect the OS does not properly clean up resources and still has active connections after r.close() or I am overseeing something in the code.
I am not sure what else I can do to make sure these sockets are closed.
EDIT:
I found out it fails on connect (https://github.com/micropython/micropython-lib/blob/master/urllib.urequest/urllib/urequest.py):
line 28:
s.connect(ai[-1])
however routercon.isconnected() returns true:
>>> routercon.isconnected()
True
>>>
How can it be that altough there is a active connection I am unable to send an http post request?
EDIT2:
When this happens sometimes I also can't post to another endpoint e.g. the test server with the same webservice
>>> r = urlopen(posturl, data=json.dumps(message).encode())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "urllib/urequest.py", line 28, in urlopen
OSError: [Errno 103] ECONNABORTED
>>> r = urlopen("http://10.0.0.8:23102/rest/v2/send", data=json.dumps(message).encode())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "urllib/urequest.py", line 28, in urlopen
OSError: [Errno 103] ECONNABORTED
>>>
Interestingly a http get to google works:
>>> r = urlopen("http://www.google.com")
>>>
If I let it sit idle for some time http post start to work again.
Could it be that the OS is performing a cleanup in the background?

Answer 1

I faced the same problem. Restarting your api endpoint device will solve the issue.