I want to transfer data from my Smartphone to the RN4020 Bluetooth module. The easiest way is to use MLDP service. But I don't want to use it as CMD/MLDP pin is connected to +3.3V. And the only way to exit from the MLDP mode is power off/on.
That's why I'm looking for another way. It should be possible to create private service for that. But I don't know is it necessary to update/create the firmware for the private service?
Thank you very much.