ESPMegaPRO-v3-SDK/Template Project/lib/ESPMegaPRO/ESPMegaIoT.cpp

#include <ESPMegaIoT.hpp>

void ESPMegaIoT::mqttCallback(char *topic, byte *payload, unsigned int length) {
    // Create a null terminated string from the payload
    memcpy(payload_buffer, payload, length);
    payload_buffer[length] = '\0';
    // Remove the base topic from the topic
    char *topic_without_base = topic + strlen(base_topic) + 1;
    // Call the respective card's mqtt callback
    // Note that after the base topic, there should be the card id
    // /base_topic/card_id/... 
    // First, get the card id in integer form
    char *card_id_str = strtok(topic_without_base, "/");
    uint8_t card_id = atoi(card_id_str);
    // Check if the card is registered
    if (components[card_id] == NULL) {
        return;
    }
    components[card_id]->handleMqttMessage(topic_without_base + 3, payload_buffer);
}