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How do I perform an audio test (Loopback) to SIM900 modules in the production line?

2018-10-15 17:27:45

Use the command: AT + AUTEST

For details, connect the SIMCom FAE team.

AT + AUTEST= <state><type>

Defined value:


0 - forbidden



0-normal audio channel

1-Aux audio channel

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