note method
Notify server that a message or messages were read or received. Does NOT return promise
Implementation
Future note(String topicName, String what, int seq) {
if (seq <= 0 || seq >= _configService.appSettings.localSeqId) {
throw Exception('Invalid message id ' + seq.toString());
}
var packet = _packetGenerator.generate(packet_types.Note, topicName);
var data = packet.data as NotePacketData;
data.what = what;
data.seq = seq;
packet.data = data;
return _send(packet);
}