TypeError on build using an external module

[Valisis]

Hi all,

I want to transfer sensor data to a MQTT broker using SDK 4.3 on fitbit studio. I already have the data transfered from the versa 2 to the companion app.

But when I try to import the mqtt module the build is fine until I try to connect the client, resulting in the following error:

In companion app:

import * as MQTT from "mqtt";

let client = MQTT.connect('mqtt://localhost:1883')

Building companion

TypeError: can't assign to property "code" on true: not an object.

Details: watchFiles: /project/companion/index.js

Build failed.

Investigating the error, I could not find any occurence of something like <something true>.code = ... inside the mqtt module.

I tried using different nodejs modules, and some seem to work, while some others produce the same build error.

I also tried to change the version of the mqtt module inside package.json bu that does not seem to have an effect at all.

If anyone encountered a similar error, please let me know if you have a solution,

Thanks

[Gondwana]

I think MQTT requires TCP access. The Fitbit environment probably won't allow access to that. You're probably limited to fetch() or WebSockets.