UART with Micro:bit and App Inventor

That is indeed progress! It is possible to communicate without sharing UUIDs. On my website there are links about the nitty gritty of MicroBit comms. It requires a minimum two chocolate biscuits and a large coffee.

https://www.professorcad.co.uk/appinventortips#TipsMicroBit

Did you pair the micro:bit? How? Best is No pairing required, that saves a lot of headache.
What does your micro:bit code look like?
Did you use Makecode to create the micro:bit code?
It has been a while since I programmed a little robot using a micro:bit. The UART remains shaky and you can do very little until the micro:bit is out of memory.

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