2023-Webservices_And_Applications/project/Core/Src/mug.c

/**
 * @file mug.c
 * @mosquitto application for group assignment
 * @author RobinVdB
 */

#include "mdns.h"
#include "httpd.h"
#include "lwip/apps/fs.h"
#include <string.h>
#include "lwip/ip_addr.h"
#include "mqtt.h"
#include "mug.h"

static void mqtt_pub_request_cb(void*, err_t);
void example_publish(mqtt_client_client_t, void*);
static void mqtt_incoming_publish_cb(void*, const char*, u32_t);
static void mqtt_incoming_data_cb(void*, const u8_t*, u16_t, u8_t);
static void mqtt_sub_request_cb(void*, err_t*);
static void mqtt_connection_cb(mqtt_client_t*, void*, mqtt_connection_status_t);
void example_do_connect(mqtt_client_t*);


static void mqtt_pub_request_cb(void *arg, err_t result)
{
  if(result != ERR_OK) {
    printf("Publish result: %d\n", result);
  }
}

int teller = 0;
void example_publish(mqtt_client_t *client, void *arg)
{
	printf("testing publish\n");
  const char *pub_payload[20];
  err_t err;
  u8_t qos = 2;
  u8_t retain = 0;
  itoa(teller, &pub_payload, 10);
  err = mqtt_publish(client, "pushbutton_event", pub_payload, strlen(pub_payload), qos, retain, mqtt_pub_request_cb, arg);
  if(err != ERR_OK) {
    printf("Publish err: %d\n", err);
  }
}


static int inpub_id;
static void mqtt_incoming_publish_cb(void *arg, const char *topic, u32_t tot_len)
{
  printf("Incoming publish at topic %s with total length %u\n", topic, (unsigned int)tot_len);

  //check for which topic a publish was received for
  if(strcmp(topic, "/input/setText") == 0) {
    inpub_id = 0;
  } else if(strcmp(topic, "/input/setImage") == 0) {
    inpub_id = 1;
  } else if(strcmp(topic, "/input/setTextColor") == 0) {
    inpub_id = 2;
  } else if(strcmp(topic, "/input/setColor") == 0) {
    inpub_id = 3;
  } else {
    //in case of wrong topic
    inpub_id = 4;
  }
}

static void mqtt_incoming_data_cb(void *arg, const u8_t *data, u16_t len, u8_t flags)
{
  printf("Incoming publish payload with length %d, flags %u\n", len, (unsigned int)flags);

  if(flags & MQTT_DATA_FLAG_LAST) {
	  if (inpub_id == 0) {
		  //places text on the lcd
	  } else if (inpub_id == 1) {
		  //places an image on the lcd
	  } else if (inpub_id == 2) {
		  //changes the text color on the lcd
	  } else if (inpub_id == 3) {
		  //changes the background color
	  } else {
		  printf("mqtt_incoming_data_cb: Ignoring payload...\n");
	  }
  } else {
  }
}

static void mqtt_sub_request_cb(void *arg, err_t result)
{
  printf("Subscribe result: %d\n", result);
}

static void mqtt_connection_cb(mqtt_client_t *client, void *arg, mqtt_connection_status_t status)
{
  printf("entered connection cb function\n");
	err_t err;
  if(status == MQTT_CONNECT_ACCEPTED) {
    printf("mqtt_connection_cb: Successfully connected\n");

    //set up callback function for input
    mqtt_set_inpub_callback(client, mqtt_incoming_publish_cb, mqtt_incoming_data_cb, arg);

	//subscribe to the topics setText, setImage, setColor and setTextcolor
    err = mqtt_subscribe(client, "/input/#", 1, mqtt_sub_request_cb, arg);

    if(err != ERR_OK) {
      printf("mqtt_subscribe return: %d\n", err);
    }
	  //publish list of images here
  } else {
    printf("mqtt_connection_cb: Disconnected, reason: %d\n", status);

    //try to reconnect
    example_do_connect(client);
  }
}

void example_do_connect(mqtt_client_t *client)
{
	printf("testing the connection\n");
  struct mqtt_connect_client_info_t ci;
  err_t err;

  memset(&ci, 0, sizeof(ci));

  ci.client_id = "lwip_test";
  ip_addr_t server_ip;
  IP4_ADDR(&server_ip, 192,168,69,11);
  uint16_t server_port = 1883;
  err = mqtt_client_connect(client, &server_ip, server_port, mqtt_connection_cb, 0, &ci);
  if(err != ERR_OK) {
    printf("mqtt_connect return %d\n", err);
  }
  if(err == ERR_OK) {
	  printf("Went into mqtt_client_connect; mqtt_connect return %d\n", err);
  }
}

void mug_init() {
	  mqtt_client_t *client = mqtt_client_new();
	    if(client != NULL) {
	    	printf("Starting connection test\n");
	      example_do_connect(client);
	    }
}