bleConnect() {
        return new Promise((resolve, reject) => {
            resolve(
                this.ble.connect(this.device.id).toPromise().then(res => {
                    console.log("Connect To Box : ", res);
                    this.infos = res;
                    this.isConnected = true;
                    this.ble.requestMtu(this.device.id, 512);
                }, error1 => {
                    console.log(error1);
                })
            ), reject(console.log('BLE : ', reject));
        });
    }

    bleNotification() {
        return new Promise((resolve, reject) => {
            resolve(
                this.ble.startNotification(this.infos.id, this.infos.characteristics[3].service,
                    this.infos.characteristics[3].characteristic).toPromise().then(res => {
                    if (res.byteLength >= 6) {
                        this.random = this.ab2str(res);
                    }
                }, async error => {
                    console.log(error);
                })
            ), reject(console.log('NOTIFICATION : ',reject));
        });
    }

    async ConnectToBox() {
        await this.bleConnect().catch(error => { console.log(error)} );
        await this.bleNotification().catch(error => { console.log(error)} );
    }