I created a b4xlib to simplify sending Firebase Cloud Messaging or as an alternative to B4J Sending Tool.
Initially it was bundled into Shao project as a bonus library.
Recently a member PM me so I created a new example to use this library.
The server is based on my Web API Server v3.30 to allow testing using a web frontend (browser) and B4X app can call the Web API using OkHttpUtils2.
If anyone interested, please PM me.
I requested $6 donation for the library and the example project.