MBMS (multicast) service with a COTS UE ?

[caseyonline]

Has anyone had success with using an MBMS (multicast) service with a COTS UE? I’m working on creating a multicast service and testing with a Pixel5 Android phone. I’ve successfully got multicast service to work using virtual radios as detailed in these app notes,

https://docs.srsran.com/projects/4g/en/latest/app_notes/source/embms/source/index.html
https://docs.srsran.com/projects/4g/en/latest/app_notes/source/zeromq/source/index.html

But I’m not having success when connecting my eNodeb with an SDR and Android. Sending a unicast packet down to my UE works fine.

I’ve created a client app on the phone that sets up a multicast socket and requests to join a multicast service. A wireshark trace on the phone shows the correct IGMP message sent out from the phone. I can see my multicast traffic being received on the eNodeb’s M1-U interface here ..

https://github.com/srsran/srsRAN_4G/blob/master/srsenb/src/stack/upper/gtpu.cc#L997

.. but these packets don’t appear to get forwarded to my UE as I’m not seeing them captured on the phone’s network interface. I’m thinking the router (in the epc) would need to receive the IGMP requests to enable it to forward the packets? Is there another trigger on the UE side perhaps that needs to be set? What about the TEID that the MBMS uses to tunnel packets to the eNodeB, does that need to be configured somewhere?

[caseyonline]

It appears eMBMS doesn't work with a COTS modem from what I'm reading in other threads,
#1327
and not hearing anything from the srsRAN maintainers.