channel/channel.go
func Send(c context.Context, clientID, message string) error {
	req := &pb.SendMessageRequest{
		ApplicationKey: &clientID,
		Message:        &message,
	}
	resp := &basepb.VoidProto{}
	return remapError(internal.Call(c, service, "SendChannelMessage", req, resp))
}
func Send(c context.Context, clientID, message string) error {
	req := &pb.SendMessageRequest{
		ApplicationKey: &clientID,
		Message:        &message,
	}
	resp := &basepb.VoidProto{}
	return remapError(internal.Call(c, service, "SendChannelMessage", req, resp))
}
// Send sends a message on the channel associated with clientID.