Posts made by fm

Hello @Capptn

It’s not very elegant, but it works for me.

The certificate is prepped with \n line endings. The code then counts the lines and replaces the line endings with \\n, then downloads line by line. Each line should yield an OK.

Note: If I try to download the certificate a second time w/o power-cycling the modem, I’ll get an error.

Thanks
Felix

const char myMqttCACert[] = {"\
-----BEGIN CERTIFICATE-----\n\
MIIEAzCCAuugAwIBAgIUBY1hlCGvdj4NhBXkZ/uLUZNILAwwDQYJKoZIhvcNAQEL\n\
BQAwgZAxCzAJBgNVBAYTAkdCMRcwFQYDVQQIDA5Vbml0ZWQgS2luZ2RvbTEOMAwG\n\
A1UEBwwFRGVyYnkxEjAQBgNVBAoMCU1vc3F1aXR0bzELMAkGA1UECwwCQ0ExFjAU\n\
BgNVBAMMDW1vc3F1aXR0by5vcmcxHzAdBgkqhkiG9w0BCQEWEHJvZ2VyQGF0Y2hv\n\
by5vcmcwHhcNMjAwNjA5MTEwNjM5WhcNMzAwNjA3MTEwNjM5WjCBkDELMAkGA1UE\n\
BhMCR0IxFzAVBgNVBAgMDlVuaXRlZCBLaW5nZG9tMQ4wDAYDVQQHDAVEZXJieTES\n\
MBAGA1UECgwJTW9zcXVpdHRvMQswCQYDVQQLDAJDQTEWMBQGA1UEAwwNbW9zcXVp\n\
dHRvLm9yZzEfMB0GCSqGSIb3DQEJARYQcm9nZXJAYXRjaG9vLm9yZzCCASIwDQYJ\n\
KoZIhvcNAQEBBQADggEPADCCAQoCggEBAME0HKmIzfTOwkKLT3THHe+ObdizamPg\n\
UZmD64Tf3zJdNeYGYn4CEXbyP6fy3tWc8S2boW6dzrH8SdFf9uo320GJA9B7U1FW\n\
Te3xda/Lm3JFfaHjkWw7jBwcauQZjpGINHapHRlpiCZsquAthOgxW9SgDgYlGzEA\n\
s06pkEFiMw+qDfLo/sxFKB6vQlFekMeCymjLCbNwPJyqyhFmPWwio/PDMruBTzPH\n\
3cioBnrJWKXc3OjXdLGFJOfj7pP0j/dr2LH72eSvv3PQQFl90CZPFhrCUcRHSSxo\n\
E6yjGOdnz7f6PveLIB574kQORwt8ePn0yidrTC1ictikED3nHYhMUOUCAwEAAaNT\n\
MFEwHQYDVR0OBBYEFPVV6xBUFPiGKDyo5V3+Hbh4N9YSMB8GA1UdIwQYMBaAFPVV\n\
6xBUFPiGKDyo5V3+Hbh4N9YSMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQEL\n\
BQADggEBAGa9kS21N70ThM6/Hj9D7mbVxKLBjVWe2TPsGfbl3rEDfZ+OKRZ2j6AC\n\
6r7jb4TZO3dzF2p6dgbrlU71Y/4K0TdzIjRj3cQ3KSm41JvUQ0hZ/c04iGDg/xWf\n\
+pp58nfPAYwuerruPNWmlStWAXf0UTqRtg4hQDWBuUFDJTuWuuBvEXudz74eh/wK\n\
sMwfu1HFvjy5Z0iMDU8PUDepjVolOCue9ashlS4EB5IECdSR2TItnAIiIwimx839\n\
LdUdRudafMu5T5Xma182OC0/u/xRlEm+tvKGGmfFcN0piqVl8OrSPBgIlb+1IKJE\n\
m/XriWr/Cq4h/JfB7NTsezVslgkBaoU=\n\
-----END CERTIFICATE-----\n\
"};

{
  int l = strlen(myMqttCACert);
  int m = 0;
  char line[100];
  int k = 0;

  for(int i = 0; i < l; i++)
  {
    if(myMqttCACert[i] == '\n') m++;
  }
  Serial.println(l);
  Serial.println(m);
  Serial.println(l+m);
  for(int i = 0; i < l; i++)
  {
    char c = myMqttCACert[i];

    if(c != '\n')
    {
      line[k++] = c;
    }
    else
    {
      line[k++] = '\\';
      line[k++] = 'n';
      line[k++] = 0x00;

      Serial2.flush();
      if(strstr(line, "-----END") == NULL)
        Serial2.printf("AT+CSETCA=0,%d,1,0,\"%s\"\r\n", l+m, line);
      else
        Serial2.printf("AT+CSETCA=0,%d,0,0,\"%s\"\r\n", l+m, line);

      delay(10);
      if(Serial2.available())
      {
        Serial.println(Serial2.readString());
      }

      k = 0;
    }
  }
}

Log output:

1452
24
1476
AT+CSETCA=0,1476,1,0,"-----BEGIN CERTIFICATE-----\n"

OK

AT+CSETCA=0,1476,1,0,"MIIEAzCCAuugAwIBAgIUBY1hlCGvdj4NhBXkZ/uLUZNILAwwDQYJKoZIhvcNAQEL\n"

OK

AT+CSETCA=0,1476,1,0,"BQAwgZAxCzAJBgNVBAYTAkdCMRcwFQYDVQQIDA5Vbml0ZWQgS2luZ2RvbTEOMAwG\n"

OK

AT+CSETCA=0,1476,1,0,"A1UEBwwFRGVyYnkxEjAQBgNVBAoMCU1vc3F1aXR0bzELMAkGA1UECwwCQ0ExFjAU\n"

OK

AT+CSETCA=0,1476,1,0,"BgNVBAMMDW1vc3F1aXR0by5vcmcxHzAdBgkqhkiG9w0BCQEWEHJvZ2VyQGF0Y2hv\n"

OK

AT+CSETCA=0,1476,1,0,"by5vcmcwHhcNMjAwNjA5MTEwNjM5WhcNMzAwNjA3MTEwNjM5WjCBkDELMAkGA1UE\n"

OK

AT+CSETCA=0,1476,1,0,"BhMCR0IxFzAVBgNVBAgMDlVuaXRlZCBLaW5nZG9tMQ4wDAYDVQQHDAVEZXJieTES\n"

OK

AT+CSETCA=0,1476,1,0,"MBAGA1UECgwJTW9zcXVpdHRvMQswCQYDVQQLDAJDQTEWMBQGA1UEAwwNbW9zcXVp\n"

OK

AT+CSETCA=0,1476,1,0,"dHRvLm9yZzEfMB0GCSqGSIb3DQEJARYQcm9nZXJAYXRjaG9vLm9yZzCCASIwDQYJ\n"

OK

AT+CSETCA=0,1476,1,0,"KoZIhvcNAQEBBQADggEPADCCAQoCggEBAME0HKmIzfTOwkKLT3THHe+ObdizamPg\n"

OK

AT+CSETCA=0,1476,1,0,"UZmD64Tf3zJdNeYGYn4CEXbyP6fy3tWc8S2boW6dzrH8SdFf9uo320GJA9B7U1FW\n"

OK

AT+CSETCA=0,1476,1,0,"Te3xda/Lm3JFfaHjkWw7jBwcauQZjpGINHapHRlpiCZsquAthOgxW9SgDgYlGzEA\n"

OK

AT+CSETCA=0,1476,1,0,"s06pkEFiMw+qDfLo/sxFKB6vQlFekMeCymjLCbNwPJyqyhFmPWwio/PDMruBTzPH\n"

OK

AT+CSETCA=0,1476,1,0,"3cioBnrJWKXc3OjXdLGFJOfj7pP0j/dr2LH72eSvv3PQQFl90CZPFhrCUcRHSSxo\n"

OK

AT+CSETCA=0,1476,1,0,"E6yjGOdnz7f6PveLIB574kQORwt8ePn0yidrTC1ictikED3nHYhMUOUCAwEAAaNT\n"

OK

AT+CSETCA=0,1476,1,0,"MFEwHQYDVR0OBBYEFPVV6xBUFPiGKDyo5V3+Hbh4N9YSMB8GA1UdIwQYMBaAFPVV\n"

OK

AT+CSETCA=0,1476,1,0,"6xBUFPiGKDyo5V3+Hbh4N9YSMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQEL\n"

OK

AT+CSETCA=0,1476,1,0,"BQADggEBAGa9kS21N70ThM6/Hj9D7mbVxKLBjVWe2TPsGfbl3rEDfZ+OKRZ2j6AC\n"

OK

AT+CSETCA=0,1476,1,0,"6r7jb4TZO3dzF2p6dgbrlU71Y/4K0TdzIjRj3cQ3KSm41JvUQ0hZ/c04iGDg/xWf\n"

OK

AT+CSETCA=0,1476,1,0,"+pp58nfPAYwuerruPNWmlStWAXf0UTqRtg4hQDWBuUFDJTuWuuBvEXudz74eh/wK\n"

OK

AT+CSETCA=0,1476,1,0,"sMwfu1HFvjy5Z0iMDU8PUDepjVolOCue9ashlS4EB5IECdSR2TItnAIiIwimx839\n"

OK

AT+CSETCA=0,1476,1,0,"LdUdRudafMu5T5Xma182OC0/u/xRlEm+tvKGGmfFcN0piqVl8OrSPBgIlb+1IKJE\n"

OK

AT+CSETCA=0,1476,1,0,"m/XriWr/Cq4h/JfB7NTsezVslgkBaoU=\n"

OK

AT+CSETCA=0,1476,0,0,"-----END CERTIFICATE-----\n"

OK

Hello @Capptn

does your MQTTs server have a log file? If yes, maybe you’ll find a clue in there about what’s going wrong?

Are you using an IP address or a domain name? The MQTTs application note example uses an IP address, but I think for the server certificate to be checked properly you’ll need to use a proper domain name.

When using a domain name, make sure you have setup the proper DNS server. You can check them with: AT+CDNSCFG? and set them with: AT+CDNSCFG="8.8.8.8".

BTW: There are several public MQTTs test servers with different settings available. Maybe give those a try.

Good luck!

Thanks
Felix

Hello guys

@Yassine-Amraue : thank you for explaining that there is a GUI and an API user. I’ve been banging my head trying to send a downlink message via API and always getting an ‘unauthorized’ error. But after registering a callback URL for the API user as well I can now send downlink messages via API to my device. Thanks again.

@magnatron : I am using a SIM7020 based device and previously via API sent downlink messages are getting delivered to it as soon as the device sends an uplink message.

Thanks
Felix