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for the normal operation of the module.
5.2 AUX detailed explanation
AUX is used for wireless transceiver buffer indication and self-check indication.
It indicates whether the module has data that has not been transmitted wirelessly, or whether the wireless
data has been received and not all sent through the serial port, or the module is in the process of initializing
and self-checking.
5.2.1 Wireless reception indication
After the module receives valid wireless data, it will immediately pull down AUX, and start the
serial port to output data. After the data output is completed, it will pull up AUX.
5.2.2 wireless transmission indication
After the module receives the serial port data, it will pull down AUX immediately and start sending
data wirelessly. After all data is sent, pull up AUX again.
5.2.3 Resetting and exiting sleep mode
Only at reset and when exiting sleep mode
