HC-06 sends command at disconnect

[0xC0DEBA5E]

The HC-06 bluetooth module sends a disconnect message over the serial connection to the arduino, when the phone is disconnected. Unfortunately this message is interpreted as a command.

I need to reinvestigate on what this disconnect message was, but my idea was to improve the protocol to send a prefix before each command. This prefix is ignored by the other modules (HC-05 and WordClocks with older firmware) to stay compatible with older versions.

Possible solutions:

1. Introduce the prefix wccp (for wordclock command protocol) as prefix before each command to distinguish between real commands and messages generated by the bluetooth module itself.
2. Detect and ignore the disconnected message only on clocks which have the new HC-06 module.