BLE plugin write returning ok but not working

Ionic Native
1

I am using BLE plugin to connect to printer (Model SEWOO LK-P400), I want just to send a “Hello World” test, the connect and disconnect part is ok, I wrote the WRITE function this way:

async print() {
    let text = new TextEncoder().encode("HELLO_WORLD");
    let value = text.buffer as ArrayBuffer;
    await this.bluetoothProvider.print(this.deviceId, this.serviceUUID, this.characteristicUUID, value)
    .then(response => {
      console.log(response);
    });
}

print(deviceId: string, serviceUUID: string, characteristicUUID: string, value: ArrayBuffer): any {
    return this.ble.write(deviceId, serviceUUID, characteristicUUID, value);
}

it’s returning OK in console but not printing nothing.

2

Can you add more context? Which exact BLE plugin are you using (there are multiple)? Are you using Cordova or Capacitor? What versions? What is this.bluetoothProvider and this.ble?

1 Like
3

Ok, let’s go

I’m using this plugin: Ionic Native - BLE

I’m using Cordova

Cordova version 11.0.0
BLE version 4.20.0 this.bluetoothProvider calls the function print that call the write function of the plugin

I’m using a Sewoo printer SEWOO LK-P400, the functions connect and disconnect it’s ok, but the write function returns ok but it’s printing, the display of the printer turns on but nothing happens