Channel maintains the receiver collection for a subject. You can add users into a channel and then broadcast message to them by channel.
Add user to channel.
frontend server id which user has connected to
Get Member info.
Get channel members.
Notice: Heavy operation.
channel member uid list
Get channel UserAmount in a channel.
channel member amount
Push message to all the members in the channel
message that would be sent to client
user-defined push options, optional