public void CheckRegistriesLimit(string projectId, string regionId)
{
List <DeviceRegistry> listRegistries = (List <DeviceRegistry>)CloudIotMqttExample.GetRegistries(projectId, regionId);
if (listRegistries != null && listRegistries.Count > 90)
{
//Clean 20 oldest registries with testing prefix in the project.
Console.WriteLine("The maximum number of registries is about to exceed.");
Console.WriteLine("Deleting the oldest 20 registries with IoT Test prefix");
var count = 20;
var index = 0;
while (count > 0)
{
if (listRegistries[index].Id.Contains("iot-test-"))
{
CloudIotSample.UnbindAllDevices(projectId, regionId, listRegistries[index].Id);
CloudIotSample.ClearRegistry(projectId, regionId, listRegistries[index].Id);
count--;
}
index++;
}
}
}
// [END iot_detach_device]
/// <summary>
/// Listens for configuration and system error messages on the gateway and
/// bound devices.
/// </summary>
// [START listen_for_config_messages]
public static object ListenForConfigMessages(string projectId, string cloudRegion,
string registryId, string deviceId, string gatewayId, int numMessages,
string privateKeyFile, string algorithm, string caCerts, string mqttBridgeHostname,
int mqttBridgePort, int jwtExpiresMinutes, int duration)
{
var clientId = $"projects/{projectId}/locations/{cloudRegion}/registries/{registryId}" +
$"/devices/{gatewayId}";
var jwtIatTime = SystemClock.Instance.GetCurrentInstant();
// Create a duration
Duration durationExp = Duration.FromMinutes(jwtExpiresMinutes);
var jwtExpTime = SystemClock.Instance.GetCurrentInstant().Plus(durationExp);
var pass = "";
if (algorithm == "RS256")
{
pass = CloudIotMqttExample.CreateJwtRsa(projectId, privateKeyFile);
}
else if (algorithm == "ES256")
{
Console.WriteLine("Currently, we do not support this algorithm.");
return(0);
}
// Use gateway to connect server
var mqttClient = GetClient(
projectId,
cloudRegion,
registryId,
gatewayId,
caCerts,
mqttBridgeHostname,
mqttBridgePort);
double initialConnectIntervalMillis = 0.5;
double maxConnectIntervalMillis = 6;
double maxConnectRetryTimeElapsedMillis = 900;
double intervalMultiplier = 1.5;
double retryIntervalMs = initialConnectIntervalMillis;
double totalRetryTimeMs = 0;
// Both connect and publish operations may fail. If they do,
// allow retries but with an exponential backoff time period.
while (!mqttClient.IsConnected &&
totalRetryTimeMs < maxConnectRetryTimeElapsedMillis)
{
try
{
// Connect to the Google MQTT bridge.
mqttClient.Connect(clientId, "unused", pass);
}
catch (AggregateException aggExceps)
{
printExceptions(aggExceps);
Console.WriteLine("Retrying in " + retryIntervalMs
+ " seconds.");
System.Threading.Thread.Sleep((int)retryIntervalMs);
totalRetryTimeMs += retryIntervalMs;
retryIntervalMs *= intervalMultiplier;
if (retryIntervalMs > maxConnectIntervalMillis)
{
retryIntervalMs = maxConnectIntervalMillis;
}
}
}
SetupMqttTopics(mqttClient, gatewayId);
AttachDevice(mqttClient, deviceId, "{}");
// Wait for about a minute for config messages.
Console.WriteLine("Listening...");
for (int i = 0; i < duration; ++i)
{
Console.Write(".");
var secSinceIssue = SystemClock.Instance.GetCurrentInstant().Minus(jwtIatTime);
if (secSinceIssue.TotalSeconds > (60 * jwtExpiresMinutes))
{
Console.WriteLine("Refreshing token after {0}s", secSinceIssue);
jwtIatTime = SystemClock.Instance.GetCurrentInstant();
// refresh token and reconnect.
pass = CloudIotMqttExample.CreateJwtRsa(projectId, privateKeyFile);
mqttClient = GetClient(
projectId,
cloudRegion,
registryId,
gatewayId,
caCerts,
mqttBridgeHostname,
mqttBridgePort);
}
System.Threading.Thread.Sleep(1000);
}
DetachDevice(mqttClient, deviceId);
// wait for the device get detached.
System.Threading.Thread.Sleep(2000);
mqttClient.Disconnect();
Console.WriteLine("Finished.");
return(0);
}
private void StartMqtt(string deviceId, string privateKeyPath)
{
CloudIotMqttExample.StartMqtt(_fixture.ProjectId, _fixture.RegionId, _fixture.RegistryId,
deviceId, privateKeyPath, "RS256", _fixture.CertPath, 1, "events", "mqtt.googleapis.com", 443, 1, 20);
}