I am using S3B modules with 8071 firmware.
I have a master module connected via USB to my PC, operating in AP1 mode.
I have another module in serial mode controlling LEDs & relays. This module also has a Rx connection to a serial sensor that outputs 12 bytes of ASCII at 2 minute intervals.
I am controlling the remote IOs with API packets.
I am seeing unusual behaviour of the DIO2 pin. Sometimes it goes low, without a P2 command being sent from the master module. It occasionally, goes high again when I send an IO command to another pin, say DIO4.
Also, a remote IS query from the master module can show the pin as low, but the XCTU remote query shows the pin set to digital output High = 5. Even after, refreshing the XCTU P2 setting. The LED connected to DIO12 (pin 4) is clearly off.
This unusual behaviour does not seem to occur, if I remove the serial sensor connection to Rx.