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I wanted to test connecting the Nano RP2040 Connect to my RPi4 MQTT server by publishing temperature and humidity data from a BME280 sensor.  I figured that this should be fairly easy since I've already used the BME280 with another RP2040 board - the SparkFun Pro Micro RP2040 and I've used my MQTT server with multiple ESP32 devices.   Of course, the devil is in the details...   I stayed within the confines of the Arduino IDE hoping that it would makes things simpler, and it did, ...

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