Unstable connection with SIM7000E, AWS and TinyGsm

abinformatica · April 26, 2023, 1:24pm

Hi everyone,
I'm having big problems connecting to AWS with MQTT protocol at servers using GSM.

At the moment I have created a generic code to use MQTT and I pass it the type of client previously created.
I can use WIFI, ETH or GSM.

With WIFI and ETH it works very well (especially with ETH).

Now I'm implementing GSM with the use of SIM7000E. I've been on it day and night for a week and I finally managed to do something but it's not stable enough.

This is that write on Serial.monitor when it's working well:

Avvio connessione GSM....
/nModem Info: SIM7000E R1351
SIM ICCID request: **************************f
Waiting for network... success
Connecting to iot.truphone.com
[36116] ### Network time and time zone updated.
Network connected
 success
GPRS connected
10.135.245.228
Qualità segnale: 31
Imposto l'ora sul RTC del ESP con connessione GSM...
Unix time ricavato da connessione GSM: 1682515544
Stampo unix time: 1682508344
[ 35673][I][AbiotMQTT.cpp:21] setup(): Connessione al broker MQTT  *************-ats.iot.eu-central-1.amazonaws.com ... topic $aws/*******************************************************************************************************
[ 47847][E][AbiotMQTT.cpp:31] setup(): Iscrizione al topic *********************************
[ 47958][I][AbiotMQTT.cpp:39] setup(): Connesso al broker: 1 
Ora attuale: 2023-04-26 14:46:01

Then it works fine for a few minutes and then it starts giving SSL problems like:

(SSLClient)(SSL_ERROR)(m_update_engine): Error writing to m_client
(SSLClient)(SSL_ERROR)(m_update_engine): 0
(SSLClient)(SSL_WARN)(connected): Socket was dropped unexpectedly (this can be an alternative to closing the connection)
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
(SSLClient)(SSL_ERROR)(available): SSL engine failed to update.
[459065] ### Unhandled: 0, SEND FAIL
[459065][I][AbiotClient.cpp:565] loop(): Network disconnected
[459175][I][AbiotClient.cpp:574] loop(): Network re-connected
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x400556b4  PS      : 0x00060830  A0      : 0x820a83b4  A1      : 0x3fce2830  
A2      : 0x00000001  A3      : 0xfffffffd  A4      : 0x000000ff  A5      : 0x0000ff00  
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x00000000  
A10     : 0x00000000  A11     : 0x3c0d3732  A12     : 0x00000000  A13     : 0x00000000  
A14     : 0x3c0d32eb  A15     : 0x00000000  SAR     : 0x00000004  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000001  LBEG    : 0x400556d5  LEND    : 0x400556e5  LCOUNT  : 0xffffffff

An other:

(SSLClient)(SSL_ERROR)(m_update_engine): Error writing to m_client
(SSLClient)(SSL_ERROR)(m_update_engine): 0
(SSLClient)(SSL_WARN)(connected): Socket was dropped unexpectedly (this can be an alternative to closing the connection)
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
(SSLClient)(SSL_ERROR)(available): SSL engine failed to update.
[1071342] ### Unhandled: 0, SEND FAIL
[1071342][I][AbiotClient.cpp:565] loop(): Network disconnected
[1088793][I][AbiotClient.cpp:574] loop(): Network re-connected
[1088857][I][AbiotClient.cpp:580] loop(): GPRS disconnected!
[1088858][I][AbiotClient.cpp:581] loop(): Connecting to 
[1088858][I][AbiotClient.cpp:582] loop(): iot.truphone.com
[1089468][I][AbiotClient.cpp:585] loop():  fail
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x400556b4  PS      : 0x00060830  A0      : 0x820a83b4  A1      : 0x3fce2830  
A2      : 0x00000001  A3      : 0xfffffffd  A4      : 0x000000ff  A5      : 0x0000ff00  
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x00000000  
A10     : 0x00000000  A11     : 0x3c0d3732  A12     : 0x00000000  A13     : 0x00000000  
A14     : 0x3c0d32eb  A15     : 0x00000000  SAR     : 0x00000004  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000001  LBEG    : 0x400556d5  LEND    : 0x400556e5  LCOUNT  : 0xffffffff

still...

(SSLClient)(SSL_ERROR)(available): SSL engine failed to update.
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x400556b4  PS      : 0x00060830  A0      : 0x820a83b4  A1      : 0x3fce2830  
A2      : 0x00000001  A3      : 0xfffffffd  A4      : 0x000000ff  A5      : 0x0000ff00  
A6      : 0x00ff0000  A7      : 0xff000000  A8      : 0x00000000  A9      : 0x00000000  
A10     : 0x00000000  A11     : 0x3c0d3732  A12     : 0x00000000  A13     : 0x00000000  
A14     : 0x3c0d32eb  A15     : 0x00000000  SAR     : 0x00000004  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000001  LBEG    : 0x400556d5  LEND    : 0x400556e5  LCOUNT  : 0xffffffff

Here even did not even make the first connection:

Avvio connessione GSM....
/nModem Info: SIM7000E R1351
SIM ICCID request: 8944477200000824889f
Waiting for network... success
Connecting to iot.truphone.com
[46921] ### Network time and time zone updated.
Network connected
 success
GPRS connected
10.140.124.9
Qualità segnale: 18
Imposto l'ora sul RTC del ESP con connessione GSM...
Unix time ricavato da connessione GSM: 1682520078
Stampo unix time: 1682512878
[ 48295][I][AbiotMQTT.cpp:21] setup(): Connessione al broker MQTT  a12d3wtrd05i30-ats.iot.eu-central-1.amazonaws.com ... topic $aws/rules/IoTInboundProcessingRuleCDKdev/6e3dadf2-0edf-4ac2-b94d-5128aff877d0
(SSLClient)(SSL_ERROR)(m_update_engine): Error writing to m_client
(SSLClient)(SSL_ERROR)(m_update_engine): 0
(SSLClient)(SSL_ERROR)(connected): Not connected because write error is set
(SSLClient)(SSL_ERROR)(m_print_ssl_error): SSL_CLIENT_WRITE_FAIL
(SSLClient)(SSL_WARN)(m_run_until): Terminating with write error: 
(SSLClient)(SSL_WARN)(m_run_until): 4
(SSLClient)(SSL_ERROR)(m_start_ssl): Failed to initlalize the SSL layer
(SSLClient)(SSL_ERROR)(m_print_br_error): Unknown error code: 0
.[ 94096][E][AbiotMQTT.cpp:27] setup(): Impossibile connettersi al broker MQTT
Ora attuale: 2023-04-26 14:42:04

So, my code is (I put only GSM part)..... in setup() function I have:

this->sslClient->setMutualAuthParams(mTLS);
Serial.println("Avvio connessione GSM....");
        pinMode(ALIM_GSM, OUTPUT);
        digitalWrite(ALIM_GSM, HIGH);
        pinMode(GSM_ON, OUTPUT);
        digitalWrite(GSM_ON, LOW);

        pinMode(GSM_RESET, OUTPUT);
        digitalWrite(GSM_RESET, LOW);
        SerialAT->begin(9600);
        delay(100);

        // verifico se il modem è spento se lo è lo accendo il modem utilizzando il PIN PWKEY
        while (!gsmModem->testAT())
        {
            Serial.println("Il modem è spento, lo accendo.");
            digitalWrite(GSM_ON, HIGH);
            delay(1200);
            Serial.println("Ho tenuto su il pin ON per 1200ms");
            digitalWrite(GSM_ON, LOW);
            delay(2000);
        }

        Serial.print("/nModem Info: ");
        Serial.println(gsmModem->getModemInfo());
        delay(100);
        Serial.print("SIM ICCID request: ");
        Serial.println(gsmModem->getSimCCID());
        delay(100);
        gsmModem->setNetworkMode(38);
        delay(100);
        gsmModem->setPreferredMode(1);
        delay(100);
        Serial.print("Waiting for network...");
        while (!gsmModem->waitForNetwork())
        {
            Serial.println(" fail");
            delay(10000);
        }
        Serial.println(" success");

        // GPRS connection parameters are usually set after network registration
        Serial.print(F("Connecting to "));
        Serial.println(GSM_APN);
        delay(100);
        while (!gsmModem->gprsConnect(GSM_APN, GSM_USER, GSM_PASS))
        {
            Serial.println("GPRS Connect: fail");
            delay(10000);
        }
        delay(100);
        if (gsmModem->isNetworkConnected())
        {
            Serial.println("Network connected");
        }
        Serial.println(" success");
        delay(100);
        if (gsmModem->isGprsConnected())
        {
            Serial.println("GPRS connected");
        }
        Serial.println(gsmModem->getLocalIP());
        delay(100);
        Serial.print("Qualità segnale: ");
        Serial.println(gsmModem->getSignalQuality());
        delay(100);
        /*
        SerialAT->println("AT+CPSI?"); // Get connection type and band
        delay(500);
        if (SerialAT->available())
        {
            String r = SerialAT->readString();
            Serial.println(r);
        }
        */
        Serial.println("Imposto l'ora sul RTC del ESP con connessione GSM...");
        getGSMTIME();
        break;




      this->mqtt = new PubSubClient(AWS_IOT_ENDPOINT, 8883, AbiotMQTT::subscribeHandler, this->client);
    delay(500);
    log_i("Connessione al broker MQTT  %s ... topic %s", AWS_IOT_ENDPOINT, TOPIC_INBOUND);
    // Connect to MQTT Broker

    while (!mqtt->connect(CONSORTIUM_ID))
    {
        Serial.print(".");
        log_e("Impossibile connettersi al broker MQTT");
        return false;
    }

    log_e("Iscrizione al topic %s", TOPIC_SUB);
    while (!mqtt->subscribe(TOPIC_SUB))
    {
        Serial.print(".");
        delay(500);
    }
    delay(100);

    log_i("Connesso al broker: %s ", String(mqtt->connected()).c_str());
    return mqtt->connected();

In loop() function:

  // Make sure we're still registered on the network
        if (!gsmModem->isNetworkConnected())
        {
            log_i("Network disconnected");
            if (!gsmModem->waitForNetwork(180000L, true))
            {
                log_i(" fail");
                delay(10000);
                return;
            }
            if (gsmModem->isNetworkConnected())
            {
                log_i("Network re-connected");
            }

            // and make sure GPRS/EPS is still connected
            if (!gsmModem->isGprsConnected())
            {
                log_i("GPRS disconnected!");
                log_i("Connecting to ");
                log_i(GSM_APN);
                if (!gsmModem->gprsConnect(GSM_APN, GSM_USER, GSM_PASS))
                {
                    log_i(" fail");
                    delay(10000);
                    return;
                }
                if (gsmModem->isGprsConnected())
                {
                    log_i("GPRS reconnected");
                }
            }
        }

        break;






if (!mqtt->connected())
    {
        lostConnection++;
        log_i("Connessione persa %s volte", lostConnection);
        log_i("Connessione con broker MQTT disconnesso");
        // Reconnect every 10 seconds
        uint32_t t = millis();
        if (t - lastReconnectAttempt > 1000L)
        {

            while (!mqtt->connect(CONSORTIUM_ID))
            {

                log_e("Impossibile connettersi al broker MQTT");
                lastReconnectAttempt = 0;
                return;
            }

            log_e("Iscrizione al topic %s", TOPIC_SUB);
            while (!mqtt->subscribe(TOPIC_SUB))
            {

                delay(500);
            }
            delay(100);

            log_i("Connesso al broker: %s ", String(mqtt->connected()).c_str());
        }
    }
    this->mqtt->loop();

From what I understand I have problems with SSL but I don't understand what I'm doing wrong.

I saw that the TinyGsm library has two objects:

 #define TINY_GSM_MODEM_SIM7000
 #define TINY_GSM_MODEM_SIM7000SSL

And I use the first of this.

My include is:

#include <TinyGsmClient.h>

And the object is:

TinyGsm *gsmModem;

abinformatica · June 27, 2023, 5:34am

Nobady?

amy_smith · November 3, 2023, 3:41am

You're having trouble with a device called SIM7000E that connects to the internet using GSM. It works at first but then runs into problems, and you see some complicated error messages.

Here are simple things to try:

Make sure the signal for your device is strong and steady.
If it stops working, tell your device to try again a few times before giving up.
Check if there are any updates for your device's software. New updates might fix the problem.
Your device should be careful with how it uses memory. Make sure it's not using too much.

If these steps don't work, ask someone who knows more about this, like a grown-up or a teacher, for help. They might be able to solve the problem for you.

system · May 1, 2024, 3:41am

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.

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Unstable connection with SIM7000E, AWS and TinyGsm

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