Android: char. notifications not working for certain devices (startNotification) #1055
Description
First of all, a huge "thank you" for this awesome package!
I'm having a problem where startNotification() never calls the success callback on a specific device. It's a BLE bridge to a GPS receiver.
However, notifications work without any problems on the same smartphone when using WebBluetooth in Chrome.
The code used is the same because I pack the cordova-plugin-ble-central API in a WebBluetooth wrapper.
The problematic device offers a typical service 6e400001-b5a3-f393-e0a9-e50e24dcca9e and should continuously deliver data via the characteristic 6e400003-b5a3-f393-e0a9-e50e24dcca9e.
The matching peripheral.characteristics[] entry looks like this:
When I query the characteristic directly with read(), I receive some of the bytes that I should receive via notifications. The UUID should therefore be correct.
Any tips on what I could try to solve the problem?
PS: When talking to different BLE devices (completely different types, like cameras or scales), startNotification() from cordova-plugin-ble-central works without any problems (also with my WebBluetooth wrapper).
Edit: minimal example:
const mac = "F4:65:0B:6F:BA:4E";
const serviceId = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
const charId = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
ble.connect(mac, () => console.log("CONNECTED"), err => console.error(err));
// ...prints "CONNECTED"
ble.startNotification(mac, serviceId, charId, buf => console.log("NOTIFICATION:", buf), err => console.error(err));
// ...no output
ble.read(mac, serviceId, charId, buf => console.log("READ:", buf), err => console.error(err));
// ...prints "READ: ArrayBuffer(348)" on every read() callEdit2: made clear that notifications work with other BLE devices (not other phones).