Redis needed for sending messages to clients. Install and launch it before starting Rotor:

Windows

Download and install latest MSI installer. Run executable.

OSX

brew install redis
redis-server

Ubuntu

sudo apt-get install redis-server
sudo service redis-server status

Test it on terminal:

// for testing with physical devices
redis-server --protected-mode no
 
// logs
redis-cli monitor
 
// test channels (sub/pub)
redis-cli PUBLISH d7bec76dac4e holi // redis-cli PUBLISH <Flamebase.id> message