Using the HC-06 Bluetooth Module

After my first post using a Bluetooth module, things have evolved a bit. The challenge with these Bluetooth modules is: they look the same, but having different firmware. I did not fully realize that until I have ordered another bluetooth module from That module comes already on a carrier, so I assumed I can use the same driver as for my other module. I was wrong :-(. HC-05 or HC-06 My earlier modul ...

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