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Test AT+CNMP command with AT Command Tester
Try this script included in AT Command Tester Tool.
//Script: at+cnbp
//This AT command is applicable for SIMCOM modules only
//Check SIMCOM Module AT Command documentaiton
//Preferred Band Selection
//Get the list of supported modes
AT+CNBP=?
//Set the preferred band
AT+CNBP=0x000700000FFF0380
//Wait
WAIT=2
//Set mode to automatic
AT+CNBP?
?
Output of above script in AT Command Tester Tool.
AT+CNBP=?
ERROR
AT+CNBP=0x000700000FFF0380
OK
AT+CNBP?
+CNBP: 0x000700000FFF0380,0x000000803B0F38DF,0x000000000000003F
OK