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Seems sending plain text over BLE is not possible. Work around is using Eddystone and filter the text on my robot device. On forum items I see the use of : NRF.setAdvertising({},{manufacturer: 0x0590, manufacturerData:"Hello"}); but using this on the Bangle.js it will only advertise Hex code.
But i am also struggling with MQTT topics. I modified a step-counter a bit to send the steps to my device over BLE using 0xffff but also sending my HRM the same time using 0xffff this will automatic create the MQTT topic data for both values. I can't find how to give the HRM and the Steps data a different topic name like data/hrm and data/steps.
user133055
Are there any other MQTT messages? Usually when you send manufacturerdata of 0x590 that is Espruino's manufacturer code, so EspruinoHub will decode the JSON into individual MQTT packets