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Test AT+CTZU command with AT Command Tester
Try this script included in AT Command Tester Tool.
//Script: at+ctzu
//This command is used for automatic time and time zone update
//Get the command support
AT+CTZU=?
//Wait
WAIT=2
//Query the current system mode
AT+CTZU?
//Wait
WAIT=2
//Disable automatic time zone update via NITZ (network identity and time zone)
AT+CTZU=0
//Wait
WAIT=2
//Enable automatic time zone update via NITZ (network identity and time zone)
AT+CTZU=1
?
Output of above script in AT Command Tester Tool.
AT+CTZU=?
+CTZU: (0-1)
OK
AT+CTZU?
+CTZU: 0
OK
AT+CTZU=0
OK
AT+CTZU=1
OK
+STIN: 81