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Code: mqtt.cpp Select all

// Configure the MQTT client

esp_transport_handle_t at =

    esp_transport_at_init(Modem::getInstance().getDCE());

if (!at) {

  ESP_LOGE(TAG, "Failed to initialize the AT transport!");

  return false;

}



// Configure the TLS transport

esp_transport_handle_t ssl = esp_transport_tls_init(at);

if (!ssl) {

  ESP_LOGE(TAG, "Failed to initialize the SSL transport!");

  return false;

}



idf::mqtt::BrokerConfiguration broker{

    .address = {idf::mqtt::URI{"mqtts://" + std::string{MQTT_BROKER_URL} +

                               ":" + std::to_string(MQTT_PORT)}},

    .security = idf::mqtt::CryptographicInformation{

        idf::mqtt::PEM{.data = mqtt_pem_start}}};

idf::mqtt::ClientCredentials credentials{

    .username = MQTT_SUID,

    .authentication = idf::mqtt::Password{.data = MQTT_PASSWORD},

    .client_id = MQTT_SUID};

idf::mqtt::Network network{.transport = ssl};

idf::mqtt::Configuration config{.network = network};



// Store the client as a member variable

mqtt_client = std::make_unique<MQTTClient>(broker, credentials, config);

Code: Select all

#!/bin/bash
#
# Extract the root certificate from ${HOST}:${PORT}.

#set -x

#HOST="mqtt.eclipseprojects.io"
HOST="broker.emqx.io"
PORT="8883"

openssl s_client -showcerts -connect $HOST:$PORT </dev/null >hoge

start=`grep -e "-----BEGIN CERTIFICATE-----" -n hoge | sed -e 's/:.*//g' | tail -n 1`

last=`grep -e "-----END CERTIFICATE-----" -n hoge | sed -e 's/:.*//g' | tail -n 1`

sed -n ${start},${last}p hoge > root_cert.pem

rm hoge

Code: Select all

mbedtls_ssl_handshake returned() returned -0x2462
-0x2462: X509 - The date tag or value is invalid : ASN1 - ASN1 tag was of an unexpected value