public async void SendToDevice()
 {
     foreach (JObject jo in ja_messages)
     {
         JObject jo_header              = (JObject)jo[RbFormatType.RbHeader];
         string  jo_TargetType          = (string)jo_header["TargetType"];
         string  jo_TargetDeviceGroupId = (string)jo_header["TargetDeviceGroupId"];
         string  jo_TargetDeviceId      = (string)jo_header["TargetDeviceId"];
         string  msg = JsonConvert.SerializeObject(jo);
         if (jo_TargetType == RbTargetType.Device)
         {
             CloudQueue cloudQueue = cloudQueueClient.GetQueueReference(jo_TargetDeviceId);
             // Create the queue if it doesn't already exist
             cloudQueue.CreateIfNotExists();
             cloudQueue.AddMessage(new CloudQueueMessage(msg));
         }
         else
         {
             DeviceGroup   dg         = new DeviceGroup(jo_TargetDeviceGroupId, sqlConnString);
             List <string> deviceList = dg.GetDeviceGroupList();
             foreach (string deviceId in deviceList)
             {
                 CloudQueue cloudQueue = cloudQueueClient.GetQueueReference(deviceId);
                 // Create the queue if it doesn't already exist
                 cloudQueue.CreateIfNotExists();
                 await cloudQueue.AddMessageAsync(new CloudQueueMessage(msg));
             }
         }
     }
 }
        public async void SendToDevice()
        {
            foreach (JObject jo in ja_messages)
            {
                JObject jo_header              = (JObject)jo[RbFormatType.RbHeader];
                string  jo_TargetType          = (string)jo_header["TargetType"];
                string  jo_TargetDeviceGroupId = (string)jo_header["TargetDeviceGroupId"];
                string  jo_TargetDeviceId      = (string)jo_header["TargetDeviceId"];
                string  msg = JsonConvert.SerializeObject(jo);
                if (jo_TargetType == RbTargetType.Device)
                {
                    var           sendMessage   = new Message(Encoding.UTF8.GetBytes(msg));
                    ServiceClient serviceClient = ServiceClient.CreateFromConnectionString(iotHubConnString);
                    await serviceClient.SendAsync(jo_TargetDeviceId, sendMessage);

                    await serviceClient.CloseAsync();
                }
                else
                {
                    DeviceGroup   dg            = new DeviceGroup(jo_TargetDeviceGroupId, sqlConnString);
                    List <string> deviceList    = dg.GetDeviceGroupList();
                    ServiceClient serviceClient = ServiceClient.CreateFromConnectionString(iotHubConnString);
                    var           sendMessage   = new Message(Encoding.UTF8.GetBytes(msg));
                    foreach (string deviceId in deviceList)
                    {
                        await serviceClient.SendAsync(deviceId, sendMessage);
                    }
                    await serviceClient.CloseAsync();
                }
            }
        }