string session_id
string peer_id
string signaling_state
string ice_connection_state
string ice_gathering_state
ros_webrtc/MediaConstraints sdp_constraints
bool is_offerer
ros_webrtc/Track[] local_tracks
ros_webrtc/Track[] remote_tracks
ros_webrtc/DataChannel[] data_channels
session_id${description}
peer_id${description}
signaling_state${description}
ice_connection_state${description}
ice_gathering_state${description}
sdp_constraints${description}
offerer${description}
local_tracks${description}
remote_tracks${description}
data_channels${description}
${name of associated topic}
${name of associated topic}