offlineStateMessage method
注销设备
Implementation
Future offlineStateMessage() async {
stateMessage.value.state = StateMessageState.offline;
try {
client.publish(
"${deviceType.value}/${MessageAction.state}/${deviceId.value}",
jsonEncode(stateMessage.value.toJson()),
retain: true);
} catch (e, st) {
log("注销设备失败", stackTrace: st, error: e);
}
}