SODAQ SARA send UDP package to IP address won't work

SARA AFF
1

Hi everyone, I’m trying to send UDP packages to my server, but my server does not get any package. I want to debug this but it’s not clear what I can do.
Lets say I want to send UDP packages to my server 11.11.11.11 on port 5001.

I’m using a slightly modified version of this sample code: https://github.com/SodaqMoja/Sodaq_nbIOT/blob/master/examples/nbIOT_test_udp/nbIOT_test_udp.ino
I removed some unused boards, removed T-mobile connection info (I’m using Vodafone) and I removed the UDP response from the server (for now I only want to send a UDP packet, the server does not respond (yet)).

#include "Sodaq_nbIOT.h"
#include "Sodaq_wdt.h"

// Select one of the operators
#define VODAFONE_NL

#if defined(ARDUINO_SODAQ_SARA)
  #define DEBUG_STREAM SerialUSB
  #define MODEM_STREAM Serial1
  #define powerPin SARA_ENABLE
  #define enablePin SARA_TX_ENABLE
#else
  #error "Please use one of the listed boards or add your board."
#endif

#define DEBUG_STREAM SerialUSB
#define DEBUG_STREAM_BAUD 115200

#define STARTUP_DELAY 3000
#define MESSAGE_DELAY 5000

const char* apn = "nb.inetd.gdsp";
const char* cdp = "172.16.14.22";
const uint8_t band = 20;
const char* forceOperator = "20404";

Sodaq_nbIOT nbiot;

void sendMessageThroughUDP()
{
    DEBUG_STREAM.println();
    DEBUG_STREAM.println("Sending message through UDP"); // works

    int localPort = 5001;
    int socketID = nbiot.createSocket(localPort);

    if (socketID >= 7 || socketID < 0) {
        DEBUG_STREAM.println("Failed to create socket");
        return;
    }

    DEBUG_STREAM.println("Created socket!"); //works

    char* buffer = "74657374"; // test in hex
    uint8_t size = strlen(buffer);

    DEBUG_STREAM.println(nbiot.ping("11.11.11.11")); // <-- OUTPUT: 0

    int lengthSent = nbiot.socketSend(socketID, "11.11.11.11", 5001, buffer, size); 

    DEBUG_STREAM.print("Length buffer vs sent: ");
    DEBUG_STREAM.print(size);
    DEBUG_STREAM.print(" - ");
    DEBUG_STREAM.println(lengthSent); // <-- OUTPUT: Length buffer vs sent: 8 - 14573

    nbiot.closeSocket(socketID);
    DEBUG_STREAM.println("Closed socket"); //works
}

void setup()
{
    sodaq_wdt_safe_delay(STARTUP_DELAY);

    DEBUG_STREAM.begin(DEBUG_STREAM_BAUD);
    MODEM_STREAM.begin(nbiot.getDefaultBaudrate());

    DEBUG_STREAM.println("Initializing and connecting... this takes about 30 seconds."); // works

    nbiot.init(MODEM_STREAM, powerPin);
    nbiot.setDiag(DEBUG_STREAM);

#ifdef SARA_TX_ENABLE
    pinMode(SARA_TX_ENABLE, OUTPUT);
    digitalWrite(SARA_TX_ENABLE, HIGH);
#endif

#ifdef SARA_RESET
    pinMode(SARA_RESET, OUTPUT);    
    digitalWrite(SARA_RESET, HIGH);
#endif

    nbiot.overrideNconfigParam("CR_0354_0338_SCRAMBLING", true);

    if (!nbiot.connect(apn, cdp, forceOperator, band)) {
        DEBUG_STREAM.println("FAILED TO CONNECT TO MODEM");
    } else {
        DEBUG_STREAM.println("Connected to modem");
    }

    sendMessageThroughUDP();
}

void loop()
{
    sodaq_wdt_safe_delay(MESSAGE_DELAY);
    sendMessageThroughUDP();
}

That results in the following output:

Initializing and connecting... this takes about 30 seconds.
Connected to modem

Sending message through UDP
Created socket!
0
Length buffer vs sent: 8 - 14573
Closed socket
    
Sending message through UDP
Created socket!
0
Length buffer vs sent: 8 - 14573
Closed socket

My server does not get any data at all.

What am I missing here?

Using SARA-N211 rev 1.

2

Are you sure Vodafone did whitelist your server?

3

Thank you for your reply. Requested Vodafone to re-check this.

Is that the only thing that could be the problem?