Android | Ble Write Value To Characteristic

I've got problem with writing value to BLE characteristic. I send correctly array of bytes , however the major is not being changed. I've got few characteristics and there's no pro

Solution 1:

You can only have one outstanding GATT operation at a time (read / write a descriptor / characteristic). You need to wait for the corresponding completion callback (onCharacteristicRead etc) until you can send the next request.