signal
Send a signal to all subscribers of a channel.
By default, signals are limited to a message payload size of 30 bytes. This limit applies only to the payload, and not to the URI or headers. If you require a larger payload size, please contact support.
Parameters
channel
The channel which the signal will be sent to.
message
The payload which will be serialized and sent.
customMessageType
The custom type associated with the message.