BLE UuidFormatException: Invalid String format

Victor 2 months ago

while calling Ble.stringToUuid I get an exception and I really don't understand why. Doc (https://developer.garmin.com/connect-iq/api-docs/Toybox/BluetoothLowEnergy.html#stringToUuid-instance_function) says String Representation of the Uuid formatted as "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"

I am respecting such format:

// Polar PMD Service
17 >> PMD_SERVICE = Ble.stringToUuid("FB005C80-02E7-F387-1CAD-8ACD2D8DF0C");
18 >> PMD_CHAR = Ble.stringToUuid("FB005C82-02E7-F387-1CAD-8ACD2D8DF0C8");
19 >> PMD_CONTROL_POINT = Ble.stringToUuid("FB005C81-02E7-F387-1CAD-8ACD2D8DF0C8");

(UUIDs gotten from: https://github.com/polarofficial/polar-ble-sdk/blob/master/technical_documentation/online_measurement.pdf)

This code gives:

```
Error: Unhandled Exception
Exception: UuidFormatException: Invalid String format
Stack:
- initialize() at ciq-nrf-blinky\source\LBS.mc:17 0x10000bd7
- onStart() at ciq-nrf-blinky\source\Main.mc:14 0x10000c6a

```

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jim_m_58 2 months ago

The string on your line 17 is short 1 character

from line 18 and 19, looks like you are missing an "8" on the end

if you line things up, it's easy to see

PMD_SERVICE = Ble.stringToUuid("FB005C80-02E7-F387-1CAD-8ACD2D8DF0C");

PMD_CHAR = Ble.stringToUuid("FB005C82-02E7-F387-1CAD-8ACD2D8DF0C8");

Victor 2 months ago in reply to jim_m_58

wow thank you! I double checked with polar docs but the error is there

jim_m_58 2 months ago in reply to Victor

Off topic, but if you are just starting with CIQ BLE, I'd recommend getting the Nordic HW so you can test things in the sim. It could save you a ton of time. Last I looked, the dongle was about $12US and worth every penny.

Victor 2 months ago in reply to jim_m_58

I did buy it indeed. I am trying to get live data into the simulator from a Polar H10. I am quite stuck. I can't manage to read or write things. I try to get data from the HeartRateMeasurment uuid and I feel onCharacteristicWrite or onDescriptorWrite never get called.

I do connect, register profiles and see the id

jim_m_58 2 months ago in reply to Victor

For BLE HRMs like the HRM_PRO I use these for the UUIDs to read HR. On a real device, make sure the HRM isn't paired in the FW.

var HR_SERVICE = Ble.longToUuid(0x0000180D00001000L, 0x800000805F9B34FBL);

var HR_CHAR = Ble.longToUuid(0x00002a3700001000L, 0x800000805F9B34FBL);

Victor 2 months ago in reply to jim_m_58

I had also tried this unsuccessfully, I finally tried with another device and my code works. I explain my current problem here: https://forums.garmin.com/developer/connect-iq/f/discussion/389917/ble-device-disconnected-too-quickly