GSM SMS Alarm Messenger
Pro X (Premium)
38
12.
Dead Loop Problem
Please find below the possible cause of the “dead loop” problem which creates
thousands of SMS delivery. User must pay attention to the setup of phone numbers.
SMS Alarm Messenger – Unit A
SIM Card Phone Number: 12345678
9
Either “One of alarm phone number” or “Control Centre
Phone Number”: 33333333
SMS Alarm Messenger – Unit B
SIM Card Phone Number: 33333333
1. When [Unit A] alarm is triggered, it will send alarm message to alarm phone number or
control centre phone number.
2. When “alarm phone number” or “control centre phone number” is set to the phone
number of another SMS Alarm Unit [Unit B], “Dead Loop” problem happens.
3. [Unit B] receives the alarm message from [Unit A]. Since it will consider this incoming
text as a wrong command message, [Unit B] will reply to [Unit A] a message “SMS
format is error!”.
4. Then, [Unit A] receives the message “SMS format is error!” from [Unit B], it also
considers this incoming text as a wrong command message. Therefore, [Unit A] will
reply to [Unit B] a message “SMS format is error!”.
5. Again, [Unit B] receives the same message from [Unit A]. Since it will also consider this
incoming text as a wrong command message, [Unit B] will reply to [Unit A] a message
“SMS format is error!”.
6. Such case will cause a serious “Dead Loop” problem.
