sendMessage static method
Implementation
static Future<void> sendMessage(String template, String id, RavenResponseCallback? callback) async {
_checkIfSDKInitialized();
var message = RavenMessage();
message.event = template;
var recipient = Recipient();
recipient.userId = id;
message.user = recipient;
await CommunicationController(callback: callback).start(Prefs.getString(PREF_APP_ID, null)!, message);
}