MQTT With Local Server Moderators: adafruit_support_bill, adafruit

[yyjdennis]

Does anyone have an example of using the Adafruit MQTT library with a local MQTT server? I think I just have to replace the Adafruit IO url with my server's ip address and port, but I must be messing up the syntax somehow.

[brubell]

An example for this doesn't exist - we use the Adafruit IO server because it's a reliable server and people don't have to set it up.

I've used this library with a local mosquitto broker before. I do not know what error you're receiving, could you please post your code incl. the output from the serial monitor?

[matterantimatter]

I'm having a similar problem. I'm trying to connect to a local MQTT server that has no hostname (just port and IP address). When I store the IP address in the secrets.py broker entry, as a string, it appears that the esp32spi's socket module is trying to interpret it as name (it dies on a call to get_host_by_name()).

I've tried placing a tuple of the IP address in the secrets file, and embedding it directly in the code, and that doesn't work either.

I can call the esp.ping() method by IP address, but something in the call stack of the MQTT.connect() method is trying to look up the IP address by name.

[matterantimatter]

I figured out my issue. I had missed the
wifi.connect()
statement. It's the wireless equivalent of "did you check the cables?"