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Topic: Arduino YUN fails to establish connection (Read 624 times) previous topic - next topic


Our Arduino fails to establish a stable connection to our IoTP. We believe it gets an error on this row:

rc=ipstack.connect(((char *) MS_PROXY), MQTT_PORT);

but we are not sure, it keeps trying to connect over and over again....
and sometimes it doesn't get past the first "retrying connect"
Any help would be appreciated

Here is the code we are trying to run :

#include <SPI.h>
#include <Ethernet.h>
#include <IPStack.h>
#include <Countdown.h>
#include <MQTTClient.h>
#include <BridgeClient.h>
#include <Bridge.h>
#include <YunClient.h>
#define MS_PROXY "quickstart.messaging.internetofthings.ibmcloud.com"
#define MQTT_PORT 1883
#define MQTT_MAX_PACKET_SIZE 100// Update these with values suitable for your network.
byte mac[] = { 0x8D, 0xA2, 0xF8, 0x2D, 0x68, 0xB8 };
//The convention to be followed is d:quickstart:iotsample-arduino:<MAC Address>#define MQTT_CLIENTID "d:quickstart:iotsample-arduino:8da2f82d68b8"
#define MQTT_TOPIC "iot-2/evt/status/fmt/json"//For Arduino Yun, instantiate a YunClient and use the instance to declare
//an IPStack ipstack(c) instead of EthernetStack with c being the YunClient
// e.g. YunClient c;
// IPStack ipstack(c);
//EthernetClient c; // replace by a YunClient if running on a Yun
 BridgeClient c;
 IPStack ipstack(c);MQTT::Client<IPStack, Countdown, 100, 1> client = MQTT::Client<IPStack, Countdown, 100, 1>(ipstack);String deviceEvent;void setup() {
 //Ethernet.begin(mac); //For Arduino Yun, use Bridge.begin()
}void loop() {
 int rc = -1;
 if (!client.isConnected()) {
   Serial.println("Connecting to IoT Foundation for publishing Temperature");
   while (rc != 0) {
 rc = ipstack.connect(( (char *) MS_PROXY), MQTT_PORT);
   MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
   data.MQTTVersion = 3;
   data.clientID.cstring = (char *)MQTT_CLIENTID;   
   rc = -1;
   while ((rc = client.connect(data)) != 0)
   Serial.println("Connected successfully\n");
   Serial.println("Temperature(in C)\tDevice Event (JSON)");
 }  MQTT::Message message;
 message.qos = MQTT::QOS0;
 message.retained = false;
 deviceEvent = String("{\"d\":{\"myName\":\"Arduino Uno\",\"temperature\":");
 char buffer[60];
 dtostrf(getTemp(),1,2, buffer);
 deviceEvent += buffer;
 deviceEvent += "}}";
 deviceEvent.toCharArray(buffer, 60);
 message.payload = buffer;
 message.payloadlen = strlen(buffer);
 rc = client.publish(MQTT_TOPIC, message);  if (rc != 0) {
   Serial.print("return code from publish was ");
This function is reproduced as is from Arduino site => http://playground.arduino.cc/Main/InternalTemperatureSensor
double getTemp(void) {
 unsigned int wADC;
 double t;
 ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3));
 ADCSRA |= _BV(ADEN); // enable the ADC
 delay(20); // wait for voltages to become stable.
 ADCSRA |= _BV(ADSC); // Start the ADC
 // Detect end-of-conversion
 while (bit_is_set(ADCSRA,ADSC));
 // Reading register "ADCW" takes care of how to read ADCL and ADCH.
 // The offset of 324.31 could be wrong. It is just an indication.
 t = (wADC - 324.31 ) / 1.22;
 // The returned temperature is in degrees Celcius.
 return (t);

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