send Plugin Message
Sends this recipient getClassById Plugin Message on the specified outgoing channel.
The message may not be larger than MAX_MESSAGE_SIZE bytes, and the plugin must be registered to send messages on the specified channel.
Parameters
source
The plugin that sent this message.
channel
The channel to send this message on.
message
The raw message to send.
Throws
Thrown if source, channel or message is null.
Thrown if the message is too big.
Thrown if the channel is not registered for this plugin.