nrfConnect nrfToolbox rx tx

I attempted connecting to the bluetooth uart with these 2 apps on my phone.
I write into the UART Service characteristic, but it does nothing.
I wrote Bangle.buzz()
What am I doing wrong?

Sat 2021.05.22

My telepathic and mind-reading super-powers aren't picking up anything right now.

'with these 2 apps'
'I write into the UART Service characteristic'

Could be a mal-formed JSON wrapper, invalid characteristic, a typo, the command used, which apps?

'but it does nothing'
'What am I doing wrong?'

A source snippet, tutorial reference and more detail are needed here.

If you have an android phone, can you see if you can get it to work your end? By installing nrf Connect app and nrf Toolbox.

I just did the most obvious thing. If yours work, you could tell me if its simple.
If you have the time & care.
I can't really explain it more, I think its straightforward, just used their interface.

Tried another app named " Serial Bluetooth Terminal " .. and it just disconnects after I send "Bangle.buzz()"

This should work fine - I don't know why the Serial Bluetooth Terminal app would disconnect. NRF Toolbox has a 'UART' button which will communicate as well.

One thing you want to watch out for is just that you need to send a newline character so your code executes.