Espressif ESP32 At Instruction Set page 46

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8. Stop sending data:
If a packet of data that contains only +++ is received, the transparent transmission process will be
stopped. Please wait for at least one second before sending the next AT command.
Please note that if you input +++ directly by typing, the +++, may not be recognized as three
consecutive + because of the time needed for typing it. It is recommended that users deploy the
following software:
Input String: +++;
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Do NOT select Send With Enter;
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• Click Send Command.
Espressif
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7. AT Commands Examples
2017.02