Exception 28 error

[phippstech]

Hi, Im getting this error when trying to connect to MQTT:

Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads PC: 0x40212184: strnlen_P at /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/sys/xtensa/string_pgmspace.c line 51 EXCVADDR: 0x00000000 Here is the line of code that is causing the problem: void callback(char* topic, byte* payload, unsigned int length)

Any idea to what is causing this?

[cadeoalves]

I had the same errors, I tried to redo all the steps I had done since the user permissions.

[cadeoalves]

/**

• Example working with library v1.3

• */

  include

  include

  include

  include

  include

//AWS

include "sha256.h"

include "Utils.h"

//WEBSockets

include

include

//MQTT PUBSUBCLIENT LIB

include

//AWS MQTT Websocket

include "Client.h"

include "AWSWebSocketClient.h"

include "CircularByteBuffer.h"

extern "C" {

include "user_interface.h"

}

//AWS IOT config, change these:

char wifi_ssid[] = "XXXXXXX"; char wifi_password[] = "xxxxxxx"; char aws_endpoint[] = "XXXXXXXXXXXXXXX.iot.eu-west-3.amazonaws.com"; char aws_key[] = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; char aws_secret[] = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; char aws_region[] = "eu-west-3"; const char* aws_topic = "TOPIC"; int port = 443;

/ uncomment the following line to use an alternate root CA if the first one does not work / // #define ALTERNATE_ROOT_CA

ifndef ALTERNATE_ROOT_CA

// AWS root certificate - expires 2037 const char ca[] PROGMEM = R"EOF( -----BEGIN CERTIFICATE----- MIIEkjCCA3qgAwIBAgITBn+USionzfP6wq4rAfkI7rnExjANBgkqhkiG9w0BAQsF ADCBmDELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNj b3R0c2RhbGUxJTAjBgNVBAoTHFN0YXJmaWVsZCBUZWNobm9sb2dpZXMsIEluYy4x OzA5BgNVBAMTMlN0YXJmaWVsZCBTZXJ2aWNlcyBSb290IENlcnRpZmljYXRlIEF1 dGhvcml0eSAtIEcyMB4XDTE1MDUyNTEyMDAwMFoXDTM3MTIzMTAxMDAwMFowOTEL MAkGA1UEBhMCVVMxDzANBgNVBAoTBkFtYXpvbjEZMBcGA1UEAxMQQW1hem9uIFJv b3QgQ0EgMTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBALJ4gHHKeNXj ca9HgFB0fW7Y14h29Jlo91ghYPl0hAEvrAIthtOgQ3pOsqTQNroBvo3bSMgHFzZM 9O6II8c+6zf1tRn4SWiw3te5djgdYZ6k/oI2peVKVuRF4fn9tBb6dNqcmzU5L/qw IFAGbHrQgLKm+a/sRxmPUDgH3KKHOVj4utWp+UhnMJbulHheb4mjUcAwhmahRWa6 VOujw5H5SNz/0egwLX0tdHA114gk957EWW67c4cX8jJGKLhD+rcdqsq08p8kDi1L 93FcXmn/6pUCyziKrlA4b9v7LWIbxcceVOF34GfID5yHI9Y/QCB/IIDEgEw+OyQm jgSubJrIqg0CAwEAAaOCATEwggEtMA8GA1UdEwEB/wQFMAMBAf8wDgYDVR0PAQH/ BAQDAgGGMB0GA1UdDgQWBBSEGMyFNOy8DJSULghZnMeyEE4KCDAfBgNVHSMEGDAW gBScXwDfqgHXMCs4iKK4bUqc8hGRgzB4BggrBgEFBQcBAQRsMGowLgYIKwYBBQUH MAGGImh0dHA6Ly9vY3NwLnJvb3RnMi5hbWF6b250cnVzdC5jb20wOAYIKwYBBQUH MAKGLGh0dHA6Ly9jcnQucm9vdGcyLmFtYXpvbnRydXN0LmNvbS9yb290ZzIuY2Vy MD0GA1UdHwQ2MDQwMqAwoC6GLGh0dHA6Ly9jcmwucm9vdGcyLmFtYXpvbnRydXN0 LmNvbS9yb290ZzIuY3JsMBEGA1UdIAQKMAgwBgYEVR0gADANBgkqhkiG9w0BAQsF AAOCAQEAYjdCXLwQtT6LLOkMm2xF4gcAevnFWAu5CIw+7bMlPLVvUOTNNWqnkzSW MiGpSESrnO09tKpzbeR/FoCJbM8oAxiDR3mjEH4wW6w7sGDgd9QIpuEdfF7Au/ma eyKdpwAJfqxGF4PcnCZXmTA5YpaP7dreqsXMGz7KQ2hsVxa81Q4gLv7/wmpdLqBK bRRYh5TmOTFffHPLkIhqhBGWJ6bt2YFGpn6jcgAKUj6DiAdjd4lpFw85hdKrCEVN 0FE6/V1dN2RMfjCyVSRCnTawXZwXgWHxyvkQAiSr6w10kY17RSlQOYiypok1JR4U akcjMS9cmvqtmg5iUaQqqcT5NJ0hGA== -----END CERTIFICATE----- )EOF";

else

// AWS root certificate (Verisign) - expires 2036 const char ca[] PROGMEM = R"EOF( -----BEGIN CERTIFICATE----- MIIE0zCCA7ugAwIBAgIQGNrRniZ96LtKIVjNzGs7SjANBgkqhkiG9w0BAQUFADCB yjELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL ExZWZXJpU2lnbiBUcnVzdCBOZXR3b3JrMTowOAYDVQQLEzEoYykgMjAwNiBWZXJp U2lnbiwgSW5jLiAtIEZvciBhdXRob3JpemVkIHVzZSBvbmx5MUUwQwYDVQQDEzxW ZXJpU2lnbiBDbGFzcyAzIFB1YmxpYyBQcmltYXJ5IENlcnRpZmljYXRpb24gQXV0 aG9yaXR5IC0gRzUwHhcNMDYxMTA4MDAwMDAwWhcNMzYwNzE2MjM1OTU5WjCByjEL MAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQLExZW ZXJpU2lnbiBUcnVzdCBOZXR3b3JrMTowOAYDVQQLEzEoYykgMjAwNiBWZXJpU2ln biwgSW5jLiAtIEZvciBhdXRob3JpemVkIHVzZSBvbmx5MUUwQwYDVQQDEzxWZXJp U2lnbiBDbGFzcyAzIFB1YmxpYyBQcmltYXJ5IENlcnRpZmljYXRpb24gQXV0aG9y aXR5IC0gRzUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCvJAgIKXo1 nmAMqudLO07cfLw8RRy7K+D+KQL5VwijZIUVJ/XxrcgxiV0i6CqqpkKzj/i5Vbex t0uz/o9+B1fs70PbZmIVYc9gDaTY3vjgw2IIPVQT60nKWVSFJuUrjxuf6/WhkcIz SdhDY2pSS9KP6HBRTdGJaXvHcPaz3BJ023tdS1bTlr8Vd6Gw9KIl8q8ckmcY5fQG BO+QueQA5N06tRn/Arr0PO7gi+s3i+z016zy9vA9r911kTMZHRxAy3QkGSGT2RT+ rCpSx4/VBEnkjWNHiDxpg8v+R70rfk/Fla4OndTRQ8Bnc+MUCH7lP59zuDMKz10/ NIeWiu5T6CUVAgMBAAGjgbIwga8wDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8E BAMCAQYwbQYIKwYBBQUHAQwEYTBfoV2gWzBZMFcwVRYJaW1hZ2UvZ2lmMCEwHzAH BgUrDgMCGgQUj+XTGoasjY5rw8+AatRIGCx7GS4wJRYjaHR0cDovL2xvZ28udmVy aXNpZ24uY29tL3ZzbG9nby5naWYwHQYDVR0OBBYEFH/TZafC3ey78DAJ80M5+gKv MzEzMA0GCSqGSIb3DQEBBQUAA4IBAQCTJEowX2LP2BqYLz3q3JktvXf2pXkiOOzE p6B4Eq1iDkVwZMXnl2YtmAl+X6/WzChl8gGqCBpH3vn5fJJaCGkgDdk+bW48DW7Y 5gaRQBi5+MHt39tBquCWIMnNZBU4gcmU7qKEKQsTb47bDN0lAtukixlE0kF6BWlK WE9gyn6CagsCqiUXObXbf+eEZSqVir2G3l6BFoMtEMze/aiCKm0oHw0LxOXnGiYZ 4fQRbxC1lfznQgUy286dUV4otp6F01vvpX1FQHKOtw5rDgb7MzVIcbidJ4vEZV8N hnacRHr2lVz2XTIIM6RUthg/aFzyQkqFOFSDX9HoLPKsEdao7WNq -----END CERTIFICATE----- )EOF";

endif

//MQTT config const int maxMQTTpackageSize = 512; const int maxMQTTMessageHandlers = 1;

ESP8266WiFiMulti WiFiMulti;

AWSWebSocketClient awsWSclient(1000);

PubSubClient client(awsWSclient);

//# of connections long connection = 0;

//generate random mqtt clientID char generateClientID () { char cID = new char[23](); for (int i=0; i<22; i+=1) cID[i]=(char)random(1, 256); return cID; }

//count messages arrived int arrivedcount = 0;

//callback to handle mqtt messages void callback(char topic, byte payload, unsigned int length) { Serial.print("Message arrived ["); Serial.print(topic); Serial.print("] "); for (int i = 0; i < length; i++) { Serial.print((char)payload[i]); } Serial.println(); }

//connects to websocket layer and mqtt layer bool connect () { if (client.connected()) { client.disconnect (); } //delay is not necessary... it just help us to get a "trustful" heap space value delay (1000); Serial.print (millis ()); Serial.print (" - conn: "); Serial.print (++connection); Serial.print (" - ("); Serial.print (ESP.getFreeHeap ()); Serial.println (")");

//creating random client id
char* clientID = generateClientID ();

client.setServer(aws_endpoint, port);
if (client.connect(clientID)) {
  Serial.println("connected");
  return true;
} else {
  Serial.print("failed, rc=");
  Serial.print(client.state());
  return false;
}

}

//subscribe to a mqtt topic void subscribe () { client.setCallback(callback); client.subscribe(aws_topic); //subscript to a topic Serial.println("MQTT subscribed"); }

//send a message to a mqtt topic void sendmessage () { //send a message char buf[100]; strcpy(buf, "{\"state\":{\"reported\":{\"on\": false}, \"desired\":{\"on\": false}}}"); int rc = client.publish(aws_topic, buf); }

void setClock() { configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");

Serial.print("Waiting for NTP time sync: "); time_t now = time(nullptr); while (now < 8 3600 2) { delay(500); Serial.print("."); now = time(nullptr); } Serial.println(""); struct tm timeinfo; gmtime_r(&now, &timeinfo); Serial.print("Current time: "); Serial.print(asctime(&timeinfo)); }

void setup() { wifi_set_sleep_type(NONE_SLEEP_T); Serial.begin (115200); delay (2000); Serial.setDebugOutput(1);

//fill with ssid and wifi password
WiFiMulti.addAP(wifi_ssid, wifi_password);
Serial.println ("connecting to wifi");
while(WiFiMulti.run() != WL_CONNECTED) {
    delay(100);
    Serial.print (".");
}
Serial.println ("\nconnected");

setClock(); // Required for X.509 certificate  validation

//fill AWS parameters
awsWSclient.setAWSRegion(aws_region);
awsWSclient.setAWSDomain(aws_endpoint);
awsWSclient.setAWSKeyID(aws_key);
awsWSclient.setAWSSecretKey(aws_secret);
awsWSclient.setUseSSL(true);
awsWSclient.setCA(ca);
//as we had to configurate ntp time to validate the certificate, we can use it to validate aws connection as well
awsWSclient.setUseAmazonTimestamp(false);

if (connect ()){
  subscribe ();
  sendmessage ();
}

}

void loop() { //keep the mqtt up and running if (awsWSclient.connected ()) { client.loop (); } else { //handle reconnection if (connect ()){ subscribe (); } }

}