BLE Ionic

import { Component, OnInit , NgZone} from '@angular/core';

import { Platform } from '@ionic/angular';
import 'rxjs/add/operator/toPromise';
import {ActivatedRoute} from '@angular/router';
import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';
import { Storage } from '@ionic/storage';
import * as Email from '../log-in/log-in.component';
// ble
import { BluetoothLE} from '@ionic-native/bluetooth-le/ngx';
import { BLE } from '@ionic-native/ble/ngx';
import { Input, ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';
//firebase
import { AngularFirestore, AngularFirestoreCollection, AngularFirestoreDocument } from '@angular/fire/firestore';
import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-add-device',
  templateUrl: './add-device.component.html',
  styleUrls: ['./add-device.component.scss'],
})
export class AddDeviceComponent implements OnInit {

  routeParams;
  SCAN_RESULT_COUNT = 20;
  scanResult;
  id;

  found ="not found"
  devices:any[] = [];

  constructor(
    public bluetoothle: BluetoothLE,
    public plt: Platform,
    private route: ActivatedRoute,
    private storage: Storage,
    private ble: BLE,
    private ngZone: NgZone,
    private cd: ChangeDetectorRef,
    public afs: AngularFirestore,
    ) { }

    Scan(){
      this.devices = [];
      this.ble.scan([],15).subscribe(
        device => this.onDeviceDiscovered(device)
      );
      this.cd.detectChanges();
    }
    onDeviceDiscovered(device){
      console.log('Discovered' + JSON.stringify(device,null,2));
      this.ngZone.run(()=>{
        this.devices.push(device)
        //console.log(device)
        this.cd.detectChanges();

      })
    }
    connect(){
    var count = 0;
    for (let i = 0; i < this.devices.length; i++)
    {
      if (this.devices[count].name == "Argon-956S32" || this.devices[count].name == "New_Name")
      {
        this.found = "FOUND!!!"
        this.ble.connect(this.devices[count].id).subscribe(peripheralData => {


          console.log(peripheralData);

        },
        peripheralData => {
          console.log('disconnected');
        });;

        this.id = this.devices[count].id;

        this.afs.collection("usersByEmail").doc(Email.__email).collection("devices").doc(this.id).set({ID:this.id});



      }
      count = count+1;
    }
  }

  write(){
    if (this.ble.isConnected)
    {
      console.log("WE ARE CURRENTLY CONNECTED");
    var string = "HELLO"

    var array = new Uint8Array(string.length);
    for (var x = 0, l = string.length; x < l; x++) {
      array[x] = string.charCodeAt(x);
    }
    this.ble.writeWithoutResponse(this.id, "6E400001-B5A3-F393-E0A9-E50E24DCCA9E".toLowerCase(),
    "6E400002-B5A3-F393-E0A9-E50E24DCCA9E".toLowerCase(), array.buffer);
  }
  else{
    console.log("WE ARE NOT CONNECTED HELP");
  }

  }

  ngOnInit(){}

}