Sensor JSON Post stops after a few hours

[jimpower]

Re: Serial to UART POST JSON

My sensor runs for a few hours and stops with following error.


Could anyone please direct me as to where I might be going wrong please find code below

import network
import time
import pycom
import machine
import gc
import urequests

from network import WLAN

execfile('/flash/Wi-Fi/Wi-Fi.py')								

f_device = open('/flash/Config/Device_Details.txt', 'r')     	
                                                                
device_setting = f_device.readline()
device_strings = [i.strip() for i in device_setting.split(',')]
f_device.close()



gc.enable()
pycom.heartbeat(False)
uart1 = machine.UART(1, baudrate=9600, bits=8, parity=None, stop=1)
time.sleep(2)

while True:

    tmp = uart1.readall()

    res = urequests.post('https://mywebsite', json={'Weight': str(tmp)})
    res.close()
    if (res.status_code - 200) < 100: # check that response code is in the 200 range
        print("Weight POST Successful")
    else:
        print('there was some error')
    gc.collect()
    print(gc.mem_free())
    time.sleep(57)

[seb]

@jimpower

You can see here that EBADF means bad file number which would suggest an issue with sockets.

I tried to match the error above to the code you posted by line 35 is gc.collect(), is the code you posted the same code that causes the issue?

Edit: And line 112 in urequests is the get function which I dont see anywhere in your code, this is certainly not the same code

[jimpower]

This post is deleted!

[jimpower]

RS232 Weigh Sensor [Rinstrum_2100]

import network
import time
import pycom
import machine
import gc
import urequests

from network import WLAN

#INITIALISE LAN
execfile('/flash/Wi-Fi/Wi-Fi.py') # connect to wifi

#INITIALISE DEVICE DETAILS
f_device = open('/flash/Config/Device_Details.txt', 'r') # read device details from file
# file format is: Device Type, Device Location ie Fridge, Workshop A, Damp Pump
device_setting = f_device.readline()
device_strings = [i.strip() for i in device_setting.split(',')]
f_device.close()

#INITIALISE LIBRARIES

gc.enable()
pycom.heartbeat(False)
uart1 = machine.UART(1, baudrate=9600, bits=8, parity=None, stop=1)
time.sleep(2)

#INITIALISE VARIABLES

while True:

tmp = uart1.readall()

res = urequests.post('mywebsite', json={'Weight': str(tmp)})
res.close()
if (res.status_code - 200) < 100: # check that response code is in the 200 range
    print("Weight POST Successful")

print("Weight POST Successful - " + str(tmp))

else:
    print('there was some error')
gc.collect()
print(gc.mem_free())
time.sleep(57)

[seb]

@jimpower

Are you using urequests from here? https://github.com/micropython/micropython-lib/blob/master/urequests/urequests.py

[jimpower]

@seb

This seems like a different version to mine there were only 122 lines in mine, so I updated to this version and got the following error.

[jimpower]

@seb

I used latest urequests.py and changed line 53 to

ai = usocket.getaddrinfo(host, port)

I still get the same error

[timh]

@jimpower I would suggest you wrap that call in a try/except block. Catch the exception.
At that point (line 53, you are trying to resolve an address). My guess is wifi might have dropped out.

It might be worth in the exception handler checking to see if wifi is still connected, and potentially checking you can resolve the name. If all is good retry, or reconnect wifi etc..

My feeling is you should expect the link to fail at some point and your code be able to deal with it.

[jimpower]

@timh

I was leaning towards this however I'm not sure how to go about the try/except block. Would you be able to help me understand how to check if wifi is still connected and also if I can resolve name as wifi could be good without active internet access.

[timh]

@timh This is very rough (and to be honest not well structured) but for instance you could implement a check for connectivity, and if you get an error then try reconnecting.

def linkup()
    
        if wlan.isconnected():

             try:
                  usocket.getaddrinfo("someaddress.com", someport, 0, usocket.SOCK_STREAM)
             except OSError as e:
                  return False
             return True
      
        return False

Then in your main loop

try:
    res = urequests.post('https://mywebsite', json={'Weight': str(tmp)})
    res.close()
except OSError as e:
    if linkup():
        continue
    else:
        do_something_to_reconnect()
        # if this fails then may be machine.reset()

[jimpower]

@timh

I have tried to emulate what you have done but get an error could you help me to identify

def linkup():

    if wlan.isconnected():

         try:
              usocket.getaddrinfo("https://my.website.io", 8082, 0, usocket.SOCK_STREAM)
         except OSError as e:
              return False
         return True

    return False

while True:

try:
    res = urequests.post('https://my.website', json={'Weight': str(tmp)})
    res.close()
    print(str(tmp))
except OSError as e:
    if linkup():
        continue
else:
    wlan = WLAN(mode=WLAN.STA)
    wlan.connect(wifi_strings[0],  auth=(WLAN.WPA2, wifi_strings[2]), timeout = 5000)
    print('Wi-Fi Connecting To :', wifi_strings[0],)
    while not wlan.isconnected():
    	machine.idle()

gc.collect()
print(gc.mem_free())
time.sleep(50)

getting following error

[timh]

@jimpower Umm your earlier sample code shows it being imported.

Make sure you still have

 import urequests

somewhere, and it's in your deployed code.

[jimpower]

@timh

yes

import network
import time
import pycom
import machine
import gc
import urequests as requests

from network import WLAN

#INITIALISE LAN
execfile('/flash/Wi-Fi/Wi-Fi.py') # connect to wifi

#INITIALISE DEVICE DETAILS
f_device = open('/flash/Config/Device_Details.txt', 'r') # read device details from file
# file format is: Device Type, Device Location ie Fridge, Workshop A, Damp Pump
device_setting = f_device.readline()
device_strings = [i.strip() for i in device_setting.split(',')]
f_device.close()

#INITIALISE LIBRARIES

gc.enable()
pycom.heartbeat(False)
uart1 = machine.UART(1, baudrate=9600, bits=8, parity=None, stop=1)
time.sleep(2)
tmp = uart1.readall()

is above the I just didn't include it in previous post

[timh]

@jimpower ok, so why do you get no module found when you call urequests.post now when you didn't before.
I can't see all your code, just snippets. The vaious sample bits of code are being changed.

Oh I see now what the problem is, when you import urequests you are importing as requests hence the module not found error.

You will need to change the sample to requests.post

Also as an aside why do you execfile('/flash/Wi-Fi/Wi-Fi.py') rather than importing. This seems odd thing to do.