Mobile Equipment Event Reporting functionality means what cell phone is able to send the unsolicited result codes for key presses, display changes, and indicator state changes.
Run terminal emulator (Minicom or cu) and estabhlish connection with the phone.
For example(Bluetooth):
cu -l /dev/rfcomm0 -s 19200
or (IR):
cu -l /dev/ircomm0 -s 19200
or (cable):
cu -l /dev/ttyACM0 -s 19200
It should answers
Connected
Enter AT or ATZ and get answer "OK"
AT OK
Enter AT+CMER=? and get something like:
AT+CMER=? +CMER: (0,3),(0,1,2),(0),(0,1,2),(0) OK
or just
AT+CMER=? ERROR
If You got "ERROR" on "AT+CMER=..." seems Your cell phone will not work with anyRemote in AT-mode. Try to use Server-mode.
Also, it seems phone does not support event reporting for key presses if answer looks like (second item is "(0)"):
+CMER: (0,3),(0),(0),(0,1,2),(0)