COM AT+CMEE - Extended error messages
COM V1.0	10.05.2005	 T. Kleinmann

from attglobals import *

COM No error messages
AT+CMEE=0
WAIT FOR OK
AT+CSMS=3
WAIT FOR ERROR

COM Error messages as number
AT+CMEE=1
WAIT FOR OK
AT+CSMS=3
WAITFOR (1,'500')

COM Error messages as text
AT+CMEE=2
WAIT FOR OK
AT+CSMS=3
WAITFOR (1,'unknown')

AT 
WAIT FOR OK