Parsing an array

i have an array of Uint8Array and it’s contain something like this , it has 40 element and the elements are like this

 let incomePacket = new Uint8Array(40);
  incomePacket[0] = 'G';
  incomePacket[1] = 0x92;
  incomePacket[2] = '0';
  incomePacket[3] = '1';
  incomePacket[4] = '2';
  incomePacket[5] = '3';
  incomePacket[6] = '4';
  incomePacket[7] = '5';
  incomePacket[8] = '6';
  incomePacket[9] = '7';
  incomePacket[10] = '8';
  incomePacket[11] = '9';
  incomePacket[12] = 'a';
  incomePacket[13] = 'b';
  incomePacket[14] = 'c';
  incomePacket[15] = 'd';
  incomePacket[16] = 'e';
  incomePacket[17] = 'f';
  incomePacket[18] = 'G';
  incomePacket[19] = 'H';
  //NEXT PACKET
  incomePacket[20] = 'G';
  incomePacket[21] = 6;
  incomePacket[22] = 'q';
  incomePacket[23] = 'w';
  incomePacket[24] = 'e';
  incomePacket[25] = 'r';
  incomePacket[26] = 't';
  incomePacket[27] = 'y';
  incomePacket[28] = 0;
  incomePacket[29] = 0;
  incomePacket[30] = 0;
  incomePacket[31] = 0;
  incomePacket[32] = 0;
  incomePacket[33] = 0;
  incomePacket[34] = 0;
  incomePacket[35] = 0;
  incomePacket[36] = 0;
  incomePacket[37] = 0;
  incomePacket[38] = 0;
  incomePacket[39] = 0;

and that packet come from embeded device from BLE plugin , now i want to parse it like this ;

 constructor(public zone: NgZone, public navCtrl: NavController, public navParams: NavParams, public ble: BLE, platform: Platform) {
    this.tab1 = WeeklySchedulePage;
    this.tab2 = DateSchedulePage;
    this.d = navParams.get("device")["id"];
    // this.data = navParams.get("device").id;
    this.device = navParams.get("device");
    //this.connected = JSON.stringify(this.device);
    platform.ready().then(() => {
      ble.connect(navParams.get("device")["id"]).subscribe((p) => {
        this.deviceId = navParams.get("device")["id"];
        // this.d = "Success";
        zone.run(() => {
          this.status = "Connected"
          // this.status = p.characteristics.length.toString()
        })
        this.total = [];
        this.isGetContinue = false;
        // this.data = JSON.stringify(p);
        let lastChar = p.characteristics[4];
        let serviceId = lastChar.service;
        let chUUID = lastChar.characteristic;
        this.serviceWriteID = serviceId;
        this.serviceWriteUUID = chUUID;
        let lastChar2 = p.characteristics[3];
        let serviceId2 = lastChar2.service;
        let chUUID2 = lastChar2.characteristic;
        this.serviceNotificationId = serviceId2;
        this.serviceNotificationUUID = chUUID2;

        let lastCharRead = p.characteristics[0];
        let serviceIdRead = lastChar.service;
        let chUUIDRead = lastChar.characteristic;
        this.ble.startNotification(this.navParams.get("device")["id"], this.serviceNotificationId, this.serviceNotificationUUID).subscribe(m => {

         this.zone.run(()=>{
            const BLE_RXD = new Uint8Array(m);
          // this.data = String.fromCharCode.apply(null, BLE_RXD);
            this.data += '\n' + String.fromCharCode.apply(null,  new Uint8Array(m));
          if (BLE_RXD[0] === 'G'.charCodeAt(0)) {
              this.output = "IN G PORT";
            if ((BLE_RXD[1] & 0x80) === 0x80)// we have a continus packet
            {
                this.d = "IN X80"
              for (var i = 2; i < (BLE_RXD[1] & 0x7F) + 2; i++) {
                this.all_rxd[this.packet_cnt] = BLE_RXD[i];
                this.packet_cnt++;
              }

            }
            else {
                this.cdata = "IN ELSE"
              for (var z = 2; z < (BLE_RXD[1] + 2); z++) {
                this.all_rxd[this.packet_cnt] = BLE_RXD[z];
                this.packet_cnt++;
              }
              this.packet_cnt = 0;
              //print the whole recive packet
              // console.log(this.all_rxd.toString());
              // this.zone.run(() => {
              //   this.connected = "FINAL";
              // })

            }
          }
         })
})

but it never come to last else statement , when i manualy debug this code in non ionic enviroment with evertyhing work weel but in ionic it’s never come to last else