HTTPS Request via MKR NB 1500 does not work

briefschlitz · May 8, 2021, 3:48pm

Hello,

I would like to send a webhook via MKR NB 1500.
Generally the webhook works, but not in the sketch.

What am I doing wrong?

Thanks in advance!

#include <MKRNB.h>

NBSSLClient client;
GPRS gprs;
NB nbAccess;

char server[] = "<ID>.hom.ee";
char path[] = "/api/v2/webhook_trigger?webhooks_key=<KEY>&event=<EVENT>";
int port = 443;

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;
  }

  Serial.println("Starting Arduino web client.");
  boolean connected = false;
  while (!connected) {
    if ((nbAccess.begin("","iot.1nce.net") == NB_READY) && (gprs.attachGPRS("iot.1nce.net") == GPRS_READY)) {
      connected = true;
    } else {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("connecting...");
  if (client.connect(server, port)) {
    Serial.println("connected");
    client.print("GET ");
    client.print(path);
    client.println(" HTTP/1.1");
    client.print("Host: ");
    client.println(server);
    client.println("Connection: close");
    client.println();
  } else {
    Serial.println("connection failed");
  }
}

void loop() {
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  if (!client.available() && !client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    for (;;)
      ;
  }
}

johnwasser · May 8, 2021, 4:07pm

What does Serial Monitor say? (Copy the sketch output from Serial Monitor and paste it here.)

briefschlitz · May 8, 2021, 4:23pm

18:19:25.226 -> Starting Arduino web client.
18:19:30.713 -> connecting...

The internet connection is established, but nothing more happens.

johnwasser · May 8, 2021, 4:44pm

The next thing it should say is "connected" or "connection failed". Since it shows neither, it is hanging in the attempt to connect through the GPRS.

Try a few of the simpler examples to see if you can figure out how to get connected.

briefschlitz · May 8, 2021, 4:59pm

The Internet connection is established.
"Connecting..." refers to:

client.connect(server, port)

I have tested a simple page:

char server[] = "arduino.cc";
char path[] = "/";
int port = 443; // port 443 is the default for HTTPS

Here the result:

18:55:35.158 -> Starting Arduino web client.
18:55:41.331 -> connecting...
18:55:52.825 -> connected
18:55:55.094 -> HTTP/1.1 301 Moved Permanently
18:55:55.094 -> Server: nginx
18:55:55.094 -> Date: Sat, 08 May 2021 16:55:54 GMT
18:55:55.094 -> Content-Type: text/html
18:55:55.094 -> Content-Length: 178
18:55:55.094 -> Connection: close
18:55:55.094 -> Location: https://www.arduino.cc/
18:55:55.094 -> Strict-Transport-Security: max-age=500; includeSubDomains
18:55:55.094 -> X-Content-Type-Options: nosniff
18:55:55.094 -> X-XSS-Protection: 1; mode=block
18:55:55.094 -> 
18:55:55.094 -> <html>
18:55:55.094 -> <head><title>301 Moved Permanently</title></head>
18:55:55.094 -> <body bgcolor="white">
18:55:55.094 -> <center><h1>301 Moved Permanently</h1></center>
18:55:55.094 -> <hr><center>nginx</center>
18:55:55.094 -> </body>
18:55:55.094 -> </html>
18:55:55.712 -> 
18:55:55.712 -> disconnecting.

johnwasser · May 8, 2021, 5:30pm

OK, so the "simple page" worked. The next step is to compare the two line-by-line to see what the non-working sketch is doing differently.

briefschlitz · May 8, 2021, 5:49pm

There differ only two lines.

Working:

char server[] = "arduino.cc";
char path[] = "/";

Not working:

char server[] = "<ID>.hom.ee";
char path[] = "/api/v2/webhook_trigger?webhooks_key=<KEY>&event=<EVENT>";

When I type the following in a browser, everything works:

<ID>.hom.ee/api/v2/webhook_trigger?webhooks_key=<KEY>&event=<EVENT>

johnwasser · May 8, 2021, 7:29pm

I tried doing that but the Chrome browser gave me this error: "This site can't be reached: %3Cid%3E.hom.ee". I even put "https://" in front of it and got the same result. Do 'ID', 'KEY' and 'EVENT' get substituted in your browser somehow?

briefschlitz · May 8, 2021, 8:22pm

ID, KEY and EVENT are only placeholders because it is confidential data.

johnwasser · May 8, 2021, 9:28pm

Oh, you are just substituting when you post.

OK, so the working sketch took 11 seconds to connect to arduino.cc and another 3 seconds to fetch the '303' error page saying that "arduino.cc" had permanently moved to "www.arduino.cc". How long did you wait for the non-working sketch to connect?

briefschlitz · May 9, 2021, 5:28am

You can wait several minutes and nothing happens.

johnwasser · May 9, 2021, 12:20pm

That's weird. You'd expect it to either eventually succeed or eventually fail.

It might be necessary to debug the 'client.connect()' function to see if it hangs at a particular place.

Note: It might help to put "Serial.flush();" after your Serial.println(); statements. That way there won't be any useful messages stuck in the output buffer when the sketch freezes.

briefschlitz · May 9, 2021, 8:15pm

Here are more details.
When it is supposed to connect to the host, an error comes up.
See almost at the very end.

22:09:51.391 -> Connecting to the internet.
22:09:53.033 -> AT

22:09:53.033 -> OK
22:09:53.127 -> AT+CMEE=0

22:09:53.127 -> OK
22:09:53.362 -> AT+CFUN=0

22:09:53.362 -> OK
22:09:53.550 -> AT+CPIN?

22:09:53.550 -> +CPIN: READY
22:09:53.550 -> 
22:09:53.550 -> OK
22:09:53.738 -> AT+CMGF=1

22:09:53.738 -> OK
22:09:53.974 -> AT+UDCONF=1,1

22:09:53.974 -> OK
22:09:54.160 -> AT+CTZU=1

22:09:54.160 -> OK
22:09:54.348 -> AT+CGDCONT=1,"IP","iot.1nce.net"

22:09:54.348 -> OK
22:09:54.582 -> AT+UAUTHREQ=1,0

22:09:54.582 -> OK
22:09:54.770 -> AT+CFUN=1

22:09:54.770 -> OK
22:09:54.958 -> AT+CEREG?

22:09:54.958 -> +CEREG: 0,0
22:09:54.958 -> 
22:09:54.958 -> OK
22:09:55.195 -> AT+CEREG?

22:09:55.195 -> +CEREG: 0,0
22:09:55.195 -> 
22:09:55.195 -> OK
22:09:55.383 -> AT+CEREG?

22:09:55.383 -> +CEREG: 0,0
22:09:55.383 -> 
22:09:55.383 -> OK
22:09:55.570 -> AT+CEREG?

22:09:55.570 -> +CEREG: 0,2
22:09:55.570 -> 
22:09:55.570 -> OK
22:09:55.805 -> AT+CEREG?

22:09:55.805 -> +CEREG: 0,2
22:09:55.805 -> 
22:09:55.805 -> OK
22:09:55.993 -> AT+CEREG?

22:09:55.993 -> +CEREG: 0,2
22:09:55.993 -> 
22:09:55.993 -> OK
22:09:56.178 -> AT+CEREG?

22:09:56.178 -> +CEREG: 0,2
22:09:56.178 -> 
22:09:56.178 -> OK
22:09:56.413 -> AT+CEREG?

22:09:56.413 -> +CEREG: 0,2
22:09:56.413 -> 
22:09:56.413 -> OK
22:09:56.601 -> AT+CEREG?

22:09:56.601 -> +CEREG: 0,5
22:09:56.601 -> 
22:09:56.601 -> OK
22:09:57.115 -> AT+CGATT=1

22:09:57.115 -> OK
22:09:58.148 -> AT+CGACT?

22:09:58.148 -> +CGACT: 1,1
22:09:58.148 -> 
22:09:58.148 -> OK
22:09:58.148 -> Connected to the internet.
22:09:58.148 -> Connecting to the server.
22:09:58.148 -> AT+USECMNG=0,0,"AddTrust_External_CA_Root",1082

22:09:58.148 -> >
22:09:58.383 -> +USECMNG: 0,0,"AddTrust_External_CA_Root","1D3554048578B03F42424DBF20730A3F"
22:09:58.383 -> 
22:09:58.383 -> OK
22:09:58.383 -> AT+USECMNG=0,0,"Baltimore_CyberTrust_Root",891

22:09:58.383 -> >
22:09:58.572 -> +USECMNG: 0,0,"Baltimore_CyberTrust_Root","ACB694A59C17E0D791529BB19706A6E4"
22:09:58.572 -> 
22:09:58.572 -> OK
22:09:58.619 -> AT+USECMNG=0,0,"COMODO_RSA_Certification_Authority",1500

22:09:58.619 -> >
22:09:58.901 -> +USECMNG: 0,0,"COMODO_RSA_Certification_Authority","1B31B0714036CC143691ADC43EFDEC18"
22:09:58.901 -> 
22:09:58.901 -> OK
22:09:58.901 -> AT+USECMNG=0,0,"DST_Root_CA_X3",846

22:09:58.901 -> >
22:09:59.089 -> +USECMNG: 0,0,"DST_Root_CA_X3","410352DC0FF7501B16F0028EBA6F45C5"
22:09:59.089 -> 
22:09:59.089 -> OK
22:09:59.136 -> AT+USECMNG=0,0,"DigiCert_High_Assurance_EV_Root_CA",969

22:09:59.136 -> >
22:09:59.277 -> +USECMNG: 0,0,"DigiCert_High_Assurance_EV_Root_CA","D474DE575C39B2D39C8583C5C065498A"
22:09:59.323 -> 
22:09:59.323 -> OK
22:09:59.323 -> AT+USECMNG=0,0,"Entrust_Root_Certification_Authority",1173

22:09:59.323 -> >
22:09:59.558 -> +USECMNG: 0,0,"Entrust_Root_Certification_Authority","D6A5C3ED5DDD3E00C13D87921F1D3FE4"
22:09:59.558 -> 
22:09:59.558 -> OK
22:09:59.604 -> AT+USECMNG=0,0,"Equifax_Secure_Certificate_Authority",804

22:09:59.604 -> >
22:09:59.744 -> +USECMNG: 0,0,"Equifax_Secure_Certificate_Authority","67CB9DC013248A829BB2171ED11BECD4"
22:09:59.744 -> 
22:09:59.744 -> OK
22:09:59.791 -> AT+USECMNG=0,0,"GeoTrust_Global_CA",856

22:09:59.791 -> >
22:09:59.934 -> +USECMNG: 0,0,"GeoTrust_Global_CA","F775AB29FB514EB7775EFF053C998EF5"
22:09:59.934 -> 
22:09:59.934 -> OK
22:09:59.979 -> AT+USECMNG=0,0,"GeoTrust_Primary_Certification_Authority_G3",1026

22:09:59.979 -> >
22:10:00.166 -> +USECMNG: 0,0,"GeoTrust_Primary_Certification_Authority_G3","B5E83436C910445848706D2E83D4B805"
22:10:00.213 -> 
22:10:00.213 -> OK
22:10:00.213 -> AT+USECMNG=0,0,"GlobalSign",958

22:10:00.213 -> >
22:10:00.400 -> +USECMNG: 0,0,"GlobalSign","9414777E3E5EFD8F30BD41B0CFE7D030"
22:10:00.400 -> 
22:10:00.400 -> OK
22:10:00.447 -> AT+USECMNG=0,0,"Go_Daddy_Root_Certificate_Authority_G2",969

22:10:00.447 -> >
22:10:00.635 -> +USECMNG: 0,0,"Go_Daddy_Root_Certificate_Authority_G2","803ABC22C1E6FB8D9B3B274A321B9A01"
22:10:00.635 -> 
22:10:00.635 -> OK
22:10:00.682 -> AT+USECMNG=0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5",1239

22:10:00.682 -> >
22:10:00.915 -> +USECMNG: 0,0,"VeriSign_Class_3_Public_Primary_Certification_Authority_G5","CB17E431673EE209FE455793F30AFA1C"
22:10:00.915 -> 
22:10:00.915 -> OK
22:10:00.915 -> AT+USECMNG=2,0,"AmazonRootCA1"

22:10:00.961 -> ERROR
22:10:00.961 -> AT+USECMNG=0,0,"Starfield_Services_Root_Certificate_Authority_G2",1011

22:10:00.961 -> >
22:10:01.149 -> +USECMNG: 0,0,"Starfield_Services_Root_Certificate_Authority_G2","173574AF7B611CEBF4F93CE2EE40F9A2"
22:10:01.196 -> 
22:10:01.196 -> OK
22:10:01.290 -> AT+USOCR=6

22:10:01.290 -> +USOCR: 0
22:10:01.290 -> 
22:10:01.290 -> OK
22:10:01.479 -> AT+USOSEC=0,1,0

22:10:01.479 -> OK
22:10:01.713 -> AT+USECPRF=0,0,1

22:10:01.713 -> OK
22:10:01.902 -> AT+USOCO=0,"<ID>.hom.ee",443

22:12:05.220 -> ERROR
22:12:05.314 -> 
22:12:05.314 -> +UUSOCL: 0
22:12:05.406 -> AT+USOCL=0

22:12:05.453 -> ERROR
22:12:05.453 -> connection failed
22:12:05.453 -> AT+USOER

22:12:05.453 -> +USOER: 9
22:12:05.453 -> 
22:12:05.453 -> OK
22:12:05.453 -> 
22:12:05.453 -> disconnecting.

johnwasser · May 9, 2021, 8:22pm

briefschlitz:

22:10:01.713 -> OK
22:10:01.902 -> AT+USOCO=0,"<ID>.hom.ee",443

22:12:05.220 -> ERROR
22:12:05.314 -> 
22:12:05.314 -> +UUSOCL: 0
22:12:05.406 -> AT+USOCL=0

22:12:05.453 -> ERROR
22:12:05.453 -> connection failed
22:12:05.453 -> AT+USOER

22:12:05.453 -> +USOER: 9
22:12:05.453 -> 
22:12:05.453 -> OK

I wonder if the "USOER" message is reporting error type '9'. You'll have to dive into the documentation to see what the
AT+USOCO=0,"<ID>.hom.ee",443
command is trying to do and what '9' might mean.

briefschlitz · May 12, 2021, 5:29pm

The error means the following:
EBADF - Bad file descriptor (internal error)

But what does that mean in detail?

mikedoug · May 17, 2021, 9:59pm

The firmware that Arduino.cc is selling on the modems on this device is 3 years old and this is apparently a known bug with that firmware. I'm having this exact same problem and that's what I've found from researching online. Upgrading it requires that you solder a USB cable to pads on the board and getting the FW from UBlox.

Reference for the crazy soldering you will likely have to do: Firmware upgrade for UBLOX SARA-R410M-02B on the MKR NB 1500 #2 - #11 by zbelding

I'm waiting to hear back from Arduino support about this issue... Though the fact that the thread I link here is already on their forums... I don't put too much hope in a reasonable solution that avoids USB soldering.

briefschlitz · May 31, 2021, 8:32am

I would like to apologize for the late reply.

Thank you for your hint.
I have written to several departments of UBLOX in the meantime. Unfortunately they can not or do not want to help me, because the board is from Arduino.

system · September 28, 2021, 8:32am

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