When I do a ble.read() it works, but ble.startNotification() does not. Do you know why?
Phone is a Galaxy S6. Peripheral is a Raspberry Pi with my own custom Bluetooth code. Notification works as expected in the LightBlue app. I can see the identical output from read() in LightBlue when subscribing to notify.
import { Injectable } from '@angular/core';
import { BLE } from '@ionic-native/ble/ngx';
import { NgZone } from '@angular/core';
import { Platform } from '@ionic/angular';
@Injectable({
providedIn: 'root'
})
export class BtoothService {
private device_id: string;
private serviceUUID = '2FE11A47-E4B8-4522-9CFF-AA729B8215C0';
private statusUUID = '2FE11A47-E4B8-4522-9CFF-AA729B8215CF';
constructor(
private ble: BLE,
private ngZone: NgZone,
private platform: Platform,
) {
console.log('constructor()');
this.platform.ready().then(() => {
console.log('platform.ready()');
this.ble.enable().then(() => {
console.log('ble.enable()');
this.ble.isEnabled().then(() => {
console.log('ble.isEnabled()');
this.ble.startScan([]).subscribe(
device => this.onDeviceDiscovered(device),
error => {
console.log('connect() error: ', JSON.stringify(error));
});
});
});
});
}
bytesToString(buffer) {
return String.fromCharCode.apply(null, new Uint8Array(buffer));
}
onDeviceDiscovered(device) {
console.log('device.name: ', JSON.stringify(device.name));
if (!device.name) {
return;
}
if (device.name.startsWith('SecureCoop-')) {
console.log('device.name.startsWith(SecureCoop-)');
this.ngZone.run(() => {
console.log('ngZone.run()');
this.device_id = device.id;
this.ble.refreshDeviceCache(device.id, 1000);
this.ble.connect(device.id).subscribe(peripheral => {
console.log('ble.connect() peripheral: ', JSON.stringify(peripheral));
this.ble.isConnected(device.id).then(() => {
console.log('ble.isConnected()');
this.ble.read(this.device_id, this.serviceUUID, this.statusUUID).then(status => {
status = this.bytesToString(status);
console.log('read() status: ', JSON.stringify(status));
},
error => {
console.log('read() error: ', JSON.stringify(error));
});
this.ble.startNotification(this.device_id, this.serviceUUID, this.statusUUID).subscribe(status => {
status = this.bytesToString(status);
console.log('startNotification() status: ', JSON.stringify(status));
},
error => {
console.log('startNotification() error: ', JSON.stringify(error));
}
);
console.log('ble.stopScan()');
this.ble.stopScan();
console.log('Done');
});
});
});
}
}
}
2020-08-19 12:12:49.578 17668-17668/com.ionicthemes.ionic5fullapp I/Capacitor/Console: File: http://localhost/main-es2015.js - Line 923 - Msg: read() status: "[84, 101, 115, 116, 105, 110, 103]"
2020-08-19 12:12:49.710 17668-17668/com.ionicthemes.ionic5fullapp I/Capacitor/Console: File: http://localhost/main-es2015.js - Line 929 - Msg: startNotification() status: "\u0000\u0000"
LightBlue has no problem with notify/subscribe.
