Is it possible to subscribe to a MQTT topic with just the ESP and use it as a serial to MQTT bridge?

[Stulander]

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Sorry if this has been covered before. Rather than using a separate microcontroller I'd like to use the ESP as a MQTT to serial interface so industrial equipment can be connected to a cloud broker without doing any port forwarding. As opposed to modbus tcp where for example port 23 would need to be forward to the IP of the ESP.

I see that there is an el-client example sketch that can run on an arduino:

https://github.com/jeelabs/el-client/blob/master/ELClient/examples/mqtt/mqtt.ino

But is it possible to run that on the ESP itself?

My other idea is to perhaps leave the ESP in Soft-AP mode and write something for Android that can bridge the connection between esp-link and an MQTT broker. It wouldn't have to touch any corporate wifi that way.

[uzi18]

It needs to be implemented

[jschwalbe]

following. i would love this as well