mqtt_as library and esp8266

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jnogues
Posts: 3
Joined: Fri May 22, 2020 5:41 am

mqtt_as library and esp8266

Post by jnogues » Fri May 29, 2020 9:37 am

This is a question for the mqtt Jedi Peter Hinch.
I'm using the mqtt_as library with an esp8266. when uC starts up and the router is off, the program ends giving an error. I have added the following in the code for restarting, is OK?

Code: Select all

try:
    loop.run_until_complete(main(client))
finally:
    client.close()  # Prevent LmacRxBlk:1 errors
    print('++++++++Error connecting first time. Reseting...+++++++++++')
    time.sleep(10)
    machine.reset()
Regards

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pythoncoder
Posts: 4242
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Location: UK
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Re: mqtt_as library and esp8266

Post by pythoncoder » Fri May 29, 2020 9:50 am

The mqtt_as library assumes that connectivity to the broker exists on initial power up. Your fix looks OK to me. Does it work in practice?

I've been called many things in my life, not all complimentary - but I'm new to being a Jedi :D
Peter Hinch

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kevinkk525
Posts: 732
Joined: Sat Feb 03, 2018 7:02 pm

Re: mqtt_as library and esp8266

Post by kevinkk525 » Fri May 29, 2020 9:57 am

I'm just a Padawan but this is how I handle it :D

Code: Select all

 while True:
            try:
                await client.connect()
                return
            except OSError as e:
                _log.error("Error connecting to wifi or mqtt:", e)
                # not connected after trying.. not much we can do without a connection except
                # trying again.
                # Don't like resetting the machine as components could be working without wifi.
                await asyncio.sleep(10)
                continue
In way older code I was resetting the device too but at some point I realized that I also had modules that should be working without a wifi connection, e.g. if you have a button that should do something on the same device or a pump that should repeatedly turn on. So I changed it to just try again until it gets a connection.
Kevin Köck
Micropython Smarthome Firmware (with Home-Assistant integration): https://github.com/kevinkk525/pysmartnode

jnogues
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Joined: Fri May 22, 2020 5:41 am

Re: mqtt_as library and esp8266

Post by jnogues » Fri May 29, 2020 10:56 am

It works, the last 2 days. Now I try kevinkk525 solution! But Can you share where I need put this code? I'm a beginner!I

Regards!

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kevinkk525
Posts: 732
Joined: Sat Feb 03, 2018 7:02 pm

Re: mqtt_as library and esp8266

Post by kevinkk525 » Fri May 29, 2020 1:09 pm

In your main code you can put this block after you have created the "client" object:

Code: Select all

async def connect():
    while True:
            try:
                await client.connect()
                return
            except OSError as e:
                print("Error connecting to wifi or mqtt:", e)
                # not connected after trying.. not much we can do without a connection except
                # trying again.
                # Don't like resetting the machine as components could be working without wifi.
                await asyncio.sleep(10)
                continue
    
asyncio.create_task(connect())
after that you continue with your other code like:

Code: Select all

try:
    loop.run_forever()
finally:
    client.close()
    machine.reset()
Kevin Köck
Micropython Smarthome Firmware (with Home-Assistant integration): https://github.com/kevinkk525/pysmartnode

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