send method
sends a ClientMsg to relay transport sink, throw an error if relay not connected
Implementation
void send(RelayConnectivity relayConnectivity, ClientMsg msg) {
unawaited(
sendOrThrow(relayConnectivity, msg).catchError((Object error) {
Logger.log.t(() => "skip send to ${relayConnectivity.url}: $error");
}),
);
}