Hello.
It sounds like an ambitious project having 20 mp3i’s communicating with each other wirelessly using the Wixel. The radio_multi library you are referring to is used in Geoff’s “Project Tabletop Multi-Agent Grid Navigation” project, which is linked in this post. We did not write that code, but after a quick look at radioMultiTxDataBlocking(), you would need to pass “Hello\n” as that function’s “message” parameter.
I recommend reading the radio_multi’s source code, which is well-documented, to get a better understanding of how the library works. The source code can be found under wixel-sdk\libraries\src\radio_multi in radio_multi-v1.0.0.zip. You can download radio_multi-v1.0.0.zip from the project’s page on Geoff’s website.
- Amanda