Sorry for my english. I just started to use firebase in my android app.
The problem is the same as in Basic Firebase database save Here the author seems does't find solution yet.
I have given public access to databse (.read and .write - true) security rules. Database reference is shown correct. And when try to save some value to existed path (for example to "message" ) - no result.
Firebase setup correctly (all required dependencies and files).
By the way, users are authenticated by custom auth system properly.
Have no idea, why i can't save value to existed path.. (