science and technology stuff
The LSW-3 series of wifi loggers allow external programs to perform MODBUS queries via a TCP connection port 8899. I believe this is a variant of the MODBUS/TCP protocol that is assigned TCP port 502.
To perform MODBUS queries, I used pysolarmanv5 . To connect to the logger pysolarmanv5 requires the logger serial number and IP address. Initially I read the serial number off the label of the logger, and looked up the IP address from the admin page of my router. Later I noticed solarman_scan.py , which sends a broadcast UDP packet which the data logger replies to. I sometimes had to run it more than once before the logger responded to the scan packet.