Looking for some help with mqtt

[ryanjennings]

I am just getting started with micropython and the esp8266 so I am sure this is a pretty low level question, but I am stuck.

I have read over http://forum.micropython.org/viewtopic.php?f=16&t=2155 and I am sure the answer is there somewhere, but I must need more detail.

When I do
from umqtt.simple import MQTTClient
I get ImportError: no module named 'umqtt'

I am running 1.8.3-78

Thanks for the help,
Ryan

[SpotlightKid]

You need to upload the files of the "umqtt" module to your esp8266. You can find the module files in the micropython-lib Github reposiotory. You can use the Webrepl for uploading or a tool like mpfshell.

For the import command you're using, you need a directory structure like this in your esp8266's flash:

Code: Select all

umqqt/
umqqt/__init__.py
umqqt/simple.py

But if you only want to use the simple API, it might be easier to just copy the "simple.py" file to the root dir as "umqtt_simply.py" and then use

Code: Select all

from umqtt_simple import MQTTClient

[ryanjennings]

Thanks for the help. I will give that a try. I thought I had read that mqtt was included after 1.8.2 I was assuming that meant I didn't need to upload it. I had read this before from

[quote]"It was, in the official 1.8.2 release, and intended to be part of future releases.[/quote]

What does "in the release mean"? Just that it has officially been adopted, rather than someone's own library?

Thanks for helping out a new guy.

Ryan

[pythoncoder]

I gather it's available in 'release' builds and not in nightly builds - a fact which is not self-evident So try esp8266-20160809-v1.8.3.bin

[binghamd]

Like Ryan, I an new to the world of micropython and ESP8266.
I have followed Spotlightkid's suggestion and downloaded simple.puy to a ESP8266 mini board as umqtt_simple.py
From REPL and WebREPL(on a windows PC) I can connect the ESP to a Mosquitto server running on a raspberry pi and publish to it successfully, but when I try to do exactly the same in main.py it will not connect with error:-
Traceback (most recent call last):
File "main.py", line 11, in <module>
File "main.py", line 6, in main
File "umqtt_simple.py", line 56, in connect
OSError: [Errno 103] ECONNABORTED
programme is simply:-
from umqtt_simple import MQTTClient

def main(server="192.168.1.19"):
c = MQTTClient("umqtt_client", server)
c.connect()
c.publish(b"testESP", b"hello")
c.disconnect()

if __name__ == "__main__":
main()

Any suggestions would be much appreciated.

[SpotlightKid]

How do you connect to the wifi network? Are you sure the esp is connected when main.py is executed?

[pythoncoder]

@SpotlightKid is surely right. It takes some time after power up for the ESP8266 to connect - 5 to 10 seconds here. Try executing a loop along these lines before attempting to use the LAN.

Code: Select all

import utime
sta_if = network.WLAN(network.STA_IF)
while not sta_if.isconnected():
    utime.sleep(1)

[binghamd]

Thank you pythoncoder, that did the trick.