Difficulty Receiving Strings Over Bluetooth

Questions about Thunkable BLE / BlueTooth
1

Hello,

I am trying to receive 4 numbers in Thunkable through BLE. I send all 4 values in 1 string, separated by commas. The string is read properly on nRF Connect, and the Arduino code is attached. I’m confident that the device and app are connected. In Thunkable, the ‘receive string’ block returns an error that says “undefined is not a function”, and I’m not sure what that means. If I include the blocks currently greyed out, the ‘Make list from text’ line crashes the app.

I’ve also tried using the ‘when characteristics change’ block (seen in the whole app screenshot), but that condition is never even triggered, despite the characteristics being changed frequently in the Arduino code.

How should I be reading in and parsing this string?

refresh function
refresh function800×654 167 KB

error_msg
error_msg1920×2560 381 KB

Thunkable app
Thunkable app2350×1366 488 KB

arduino code
arduino code1100×682 60.4 KB

2

Hello @4001.group16zwb6dn
Based on your screenshot, it doesn’t transmit strings; it broadcasts strings (notify method).
This means that you will need to use the BLE blocks “Subscribe To Characteristics” and “Characteristics Change” to subscribe to peripheral device’s characteristics and receiving data.