postMessage method
Implementation
Future<int> postMessage(String msg, [int? id]) {
id ??= generateMessageId(msg);
return _retry(() => _client.post(
_makeuri(servers, '/$sessionId/message'),
headers: _headers,
encoding: utf8,
body: jsonEncode({'Data': msg, 'ClientMessageId': id}),
)).then((value) => value.statusCode);
}