I am using Sparqee Cell with shield for Pi 3 for SMS purposes only.
I have discovered that certain SIM card returns +ZEND as unsolicited result code at a regular interval of around 30 seconds. This interferes with our SMS sending when we run the python scripts provided and caused failure to send.
Is there any way to turn off the +ZEND ?
I have checked and the +ZEND seems to do with STK menu rebuilding.
Do you have any suggestions to resolve this issue ?
The SparqEE CELLv1.0 device.
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