I want to use the raspberry pie broker and mqtt communication using nrf52840.

[janjune]

Using two nrf52840s and a raspberry pi3, we are going to do mqtt communication.

I want to use raspberry pi3 as a broker and use nrf52840 as a subscription and issue.

What should I do with setting up a raspberry pi3 and what should I do setting up nrf52840 to send a message?

[awneil]

Presumably, you're going to use the onboard Bluetooth on the RPi as a Central, and the 2 nRFs as Peripherals?

Having got the devices connected over BLE, you will then need to devise some way to transport MQTT over BLE.

Have you tried googling for doing MQTT over BLE ?

Or for examples of doing MQTT over any other "unconventional" transport ?

If there's nothing else, the Nordic UART Service (NUS) would probably be a good starting point ...

The MQTT protocol specification is open and available for free download.

[janjune]

Thank you for your answer.

I'll give it a try.