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Topic: No mobile data over 2G possible (Read 292 times) previous topic - next topic

jgartner

I have an Arduino MKR GSM 1400 with a Hologram IoT Sim-Card. Unfortunately I could only connect to 2G-Networks so far because I live in a rural Area. I'm using the following antennas and add a battery to the Arduino additionally to a USB-Connection.

My code looks pretty much like a example-Code from Arduino or Hologram:

Code: [Select]
/*
  Web client

 This sketch connects to a website through a MKR GSM 1400 board. Specifically,
 this example downloads the URL "http://www.example.org/" and
 prints it to the Serial monitor.

 Circuit:
 * MKR GSM 1400 board
 * Antenna
 * SIM card with a data plan

 created 8 Mar 2012
 by Tom Igoe
*/

// libraries
#include <MKRGSM.h>

#include "arduino_secrets.h"
// Please enter your sensitive data in the Secret tab or arduino_secrets.h
// PIN Number
const char PINNUMBER[]     = " ";
// APN data
const char GPRS_APN[]      = "hologram";
const char GPRS_LOGIN[]    = " ";
const char GPRS_PASSWORD[] = " ";

// initialize the library instance
GSMClient client;111111111111111111111
GPRS gprs;
GSM gsmAccess(true);

// URL, path and port (for example: example.org)
char server[] = "http://www.example.org";
char path[] = "/";
int port = 80; // port 80 is the default for HTTP

void setup() {
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.println("Starting Arduino web client.");
  // connection state
  bool connected = false;

  // After starting the modem with GSM.begin()
  // attach the shield to the GPRS network with the APN, login and password
  while (!connected) {
     Serial.println("Begin gsm Access");
    Serial.println(gsmAccess.begin(0,true,false)); //Uncomment for testing
   
    if ((gsmAccess.begin() == GSM_READY) &&
        (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY)) {
      connected = true;
      Serial.println("GSM Access Success");
    }
    else {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, port)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.print("GET ");
    client.print(path);
    client.println(" HTTP/1.1");
    client.print("Host: ");
    client.println(server);
    client.println("Connection: close");
    client.println();
  } else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop() {
  Serial.println("loop start");
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.available() && !client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for (;;)
      ;
  }
}


By using this code I get the following output (including AT-Commands):

Code: [Select]
Starting Arduino web client.
Begin gsm Access
⸮AT

OK
AT+IPR=921600

OK
AT

OK
AT+UPSV=3

OK
0
⸮AT

OK
AT+IPR=921600

OK
AT

OK
AT+UPSV=3

OK
AT+CPIN?

ERROR
AT+CPIN?

+CPIN: READY

OK
AT+CMGF=1

OK
AT+UDCONF=1,1

OK
AT+CTZU=1

OK
AT+UDTMFD=1,2

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK

+UMWI: 0,1

+UMWI: 0,2

+UMWI: 0,3

+UMWI: 0,4
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,0

OK
AT+CREG?

+CREG: 0,5

OK
AT+UCALLSTAT=1

OK
AT+CGATT=1

OK
AT+UPSD=0,1,"hologram"

OK
AT+UPSD=0,6,3

OK
AT+UPSD=0,2," "

OK
AT+UPSD=0,3," "

OK
AT+UPSD=0,7,"0.0.0.0"

OK
AT+UPSDA=0,3

OK
AT+UPSND=0,8

+UPSND: 0,8,1

OK
GSM Access Success
connecting...
AT+USOCR=6

+USOCR: 0

OK
AT+USOCO=0,"http://www.example.org",80

ERROR

+UUSOCL: 0
AT+USOCL=0

ERROR
connection failed
loop start

disconnecting.


Even though it looks like no connection was made, when looking to the Hologram dashboard it has recognized a connection-attempt, here's a part of Holograms JSON-output:

Code: [Select]
{
    "success":true,
    "data":[
       {
          "session_id":606420301,
          "devicename":"Pilot (---)",
          "deviceid":347664,
          "sim":"---",
          "starttime":"2019-07-28 10:09:04",
          "endtime":"2019-07-28 11:09:42",
          "bytes":190,
          "imei":"---",
          "radio_access_technology":"2G",
          "network_name":"T-Mobile Austria GmbH",
          "tags":[
 
          ]
       }
    ]
 }


Do you have any idea on how I should change my code to reliably get data over 2G? Should I increase my timeout maybe? How would I do this?

kickouille

Hi,

AT+USOCO=0,"http://www.example.org",80

This will not work, AT+USOCO is used to create a TCP connection, so expecting a hostname or IP with a port.
Here you provided a URL.

Simply change that in your code:

char server[] = "http://www.example.org";

to

char server[] = "www.example.org";

or

char server[] = "example.org";

As it is in the original GsmWebClient examppe sketch.

Regards,

Yanik

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