I use RD2 on a Samsung Galaxy. The connection to Expedition (version 12.7.15x64 for Navionics) works for data such as AWS, TWS, etc. I can use RD2 to change active markers, synchronise the timer and send events to Expedition via RD2.
What does not work: 
- the ping test in the network settings
- transferring sailing events to Expedition (error message: no timely acknowledgement)

My instrument settings in Expedition:
Connection: UDP
Address:  xxx.xxx.xx.255
Port RX 5010
Port TX 5011
Boat xxxxxxx (boat 0)
Expedition Settings Custom: no changes or entries
Exp RX-filter settings: clear all and Receive marks enabled
Exp Tx filter settings:  only the desired data enabled

RD2 settings:
Pin RD2 on top enabled
Show Config button enabled
Network settings:
Expd IP xxx.xxx.xx.255
RX Port 5011
TX Port 5010
Data listening enabled
Auto start listening enabled

In the previous version of Expedition, I also had the problem that events were reported twice via RD2 in Expedition. However, this issue appears to have been resolved in the new version.

Translated with DeepL.com (free version)