private void doConnect() {
L.info(
"Connecting to MQTT broker "
+ mqttc.getServerURI()
+ " with CLIENTID="
+ mqttc.getClientId()
+ " and TOPIC PREFIX="
+ topicPrefix);
MqttConnectOptions copts = new MqttConnectOptions();
copts.setWill(topicPrefix + "connected", "0".getBytes(), 1, true);
copts.setCleanSession(true);
copts.setUserName("emonpi");
copts.setPassword("emonpimqtt2016".toCharArray());
try {
mqttc.connect(copts);
sendConnectionState();
L.info("Successfully connected to broker, subscribing to " + topicPrefix + "(set|get)/#");
try {
mqttc.subscribe(topicPrefix + "set/#", 1);
mqttc.subscribe(topicPrefix + "get/#", 1);
shouldBeConnected = true;
} catch (MqttException mqe) {
L.log(Level.WARNING, "Error subscribing to topic hierarchy, check your configuration", mqe);
throw mqe;
}
} catch (MqttException mqe) {
L.log(
Level.WARNING,
"Error while connecting to MQTT broker, will retry: " + mqe.getMessage(),
mqe);
queueConnect(); // Attempt reconnect
}
}
public void startListener() throws MqttException {
if (this.mqttBrokerConnectionConfiguration.getBrokerUsername() != null
&& this.mqttBrokerConnectionConfiguration.getDcrUrl() != null) {
String username = this.mqttBrokerConnectionConfiguration.getBrokerUsername();
String dcrUrlString = this.mqttBrokerConnectionConfiguration.getDcrUrl();
String scopes = this.mqttBrokerConnectionConfiguration.getBrokerScopes();
// getJWT Client Parameters.
if (dcrUrlString != null && !dcrUrlString.isEmpty()) {
PrivilegedCarbonContext.startTenantFlow();
PrivilegedCarbonContext.getThreadLocalCarbonContext().setTenantId(tenantId, true);
PrivilegedCarbonContext.getThreadLocalCarbonContext().setUsername(username);
try {
URL dcrUrl = new URL(dcrUrlString);
HttpClient httpClient = MQTTUtil.getHttpClient(dcrUrl.getProtocol());
HttpPost postMethod = new HttpPost(dcrUrlString);
RegistrationProfile registrationProfile = new RegistrationProfile();
registrationProfile.setCallbackUrl(MQTTEventAdapterConstants.EMPTY_STRING);
registrationProfile.setGrantType(MQTTEventAdapterConstants.GRANT_TYPE);
registrationProfile.setOwner(username);
registrationProfile.setTokenScope(MQTTEventAdapterConstants.TOKEN_SCOPE);
registrationProfile.setApplicationType(MQTTEventAdapterConstants.APPLICATION_TYPE);
registrationProfile.setClientName(username + "_" + tenantId);
String jsonString = registrationProfile.toJSON();
StringEntity requestEntity = new StringEntity(jsonString, ContentType.APPLICATION_JSON);
postMethod.setEntity(requestEntity);
HttpResponse httpResponse = httpClient.execute(postMethod);
if (httpResponse != null) {
String response = MQTTUtil.getResponseString(httpResponse);
try {
if (response != null) {
JSONParser jsonParser = new JSONParser();
JSONObject jsonPayload = (JSONObject) jsonParser.parse(response);
String clientId = (String) jsonPayload.get(MQTTEventAdapterConstants.CLIENT_ID);
String clientSecret =
(String) jsonPayload.get(MQTTEventAdapterConstants.CLIENT_SECRET);
JWTClientManagerService jwtClientManagerService =
MQTTUtil.getJWTClientManagerService();
AccessTokenInfo accessTokenInfo =
jwtClientManagerService
.getJWTClient()
.getAccessToken(clientId, clientSecret, username, scopes);
connectionOptions.setUserName(accessTokenInfo.getAccessToken());
}
} catch (ParseException e) {
String msg = "error occurred while parsing client credential payload";
log.error(msg, e);
} catch (JWTClientException e) {
String msg = "error occurred while parsing the response from JWT Client";
log.error(msg, e);
}
}
} catch (MalformedURLException e) {
log.error("Invalid dcrUrl : " + dcrUrlString);
} catch (KeyManagementException
| NoSuchAlgorithmException
| KeyStoreException
| IOException e) {
log.error("Failed to create an https connection.", e);
} finally {
PrivilegedCarbonContext.endTenantFlow();
}
}
}
mqttClient.connect(connectionOptions);
mqttClient.subscribe(topic);
}