Android BluetoothGatt - status 133 - register callback

Question

First of all I read SOLVED: GATT callback fails to register and took the steps suggested in that post to solve this issue with no success. The recommended fix in there if you ha

Answer 1

Android OS < 6.0：

mBluetoothDevice.connectGatt(context, false, callback);

Android OS >= 6.0：

mBluetoothDevice.connectGatt(context, false, callback, BluetoothDevice.TRANSPORT_LE);

Ultimately, hardware equipment is needed to completely solve this problem.