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The inverters communicate via UDP protocol, by default running on port 8899. They use a native 'AA55' protocol and (some models) ModBus protocol. ET inverters support both protocols, some inverters may not support both of them.
This documentation is based on experiments and various sources (see below). Thus it is incomplete and may contain errors.
Inverter detection
An inverter in the local network can be discovered by a UDP broadcast to address 255.255.255.255, port: 48899, message: WIFIKIT-214028-READ
On success, the inverter responses with it's IP address (as a text string) followed by it's WiFi AP name.
A more reliable way to access the inverter may be to access it directly by it's IP address assigned to it by a DHCP server.