Data from this issue indicates that the wifi dongle uses a MXCHIP EMW3080-E SOC.
Searches for that model number found a bunch of useful issues, including the MX Guide which contains a list of AT commands that might be supported by the module.
Further digging indicated that Solis has an App that they use to configure the logger, called Solis Cloud
- Decompile the APK using jadx-gui. Look for any hints of bluetooth or wifi connectivity configuration and AT commands