/// <summary>
/// Delete a message from the message queue once we have processed it
/// </summary>
/// <param name="message"></param>
private void DeleteMessage(SigfoxMessage message)
{
var deleteMessageRequest = new DeleteMessageRequest
{
QueueUrl = _queueUrl,
ReceiptHandle = message.RecieptHandle
};
var response = _sqsClient.DeleteMessage(deleteMessageRequest);
}
/// <summary>
/// Read all the messages from the queue and send them to the MQTT broker
/// </summary>
/// <param name="state"></param>
private void DoData(object state)
{
try
{
var receiveMessageRequest = new ReceiveMessageRequest
{
QueueUrl = _queueUrl,
MaxNumberOfMessages = 10
};
List <SigfoxMessage> messages = new List <SigfoxMessage>();
int finishedCounter = 0;
//Keep reading messages from the queue, until we get not results twice in a row.
//https://docs.aws.amazon.com/AWSSimpleQueueService/latest/APIReference/API_ReceiveMessage.html
while (finishedCounter < 2)
{
var receiveMessageResponse = _sqsClient.ReceiveMessage(receiveMessageRequest);
if (receiveMessageResponse.Messages.Count == 0)
{
finishedCounter++;
}
foreach (var message in receiveMessageResponse.Messages)
{
try
{
_log.Debug(message.Body);
JObject dmsg = JObject.Parse(message.Body);
var smsg = new SigfoxMessage(dmsg)
{
RecieptHandle = message.ReceiptHandle
};
messages.Add(smsg);
}
catch (Exception ex)
{
_log.Warn(ex);
}
}
}
//order the messages by time so we send the data to the broker in the right order
var orderedmessages = messages.OrderBy(x => x.TimeStamp).ToList();
foreach (var message in orderedmessages)
{
ProcessMessage(message);
DeleteMessage(message);
}
}
catch (Exception ex)
{
_log.Error(ex);
}
}
/// <summary>
/// Publish the message variables to MQTT broker
/// </summary>
/// <param name="message"></param>
private void ProcessMessage(SigfoxMessage message)
{
try
{
_log.Debug(message);
foreach (var kvp in message.Variables)
{
object o = new { kvp.Value, Time = message.TimeStamp.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ssZ") };
_publishData($"sigfox/{message.Site}/{kvp.Key}", JsonConvert.SerializeObject(o));
}
}
catch (Exception ex)
{
_log.Warn(ex);
}
}