Try Steinwurf's RLNC enabled OTAcast coding libraries

Steinwurf's OTAcast coding libraries make it easy to add reliable broadcast capabilities to networks where one-way communication is necessary.

Check out their blog (copied below) for details and the chance to try it out

Reproduced from the Steinwurf blog: https://www.steinwurf.com/blog/2020-04-27-otacast-no-return-channel-needed.html