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Implement MQTT client with stub implementation for FreeRTOS + wolfIP example 

Co-Authored-By: daniele@wolfssl.com <daniele@wolfssl.com>
pull/492/head
Devin AI 2025-03-14 17:16:56 +00:00
parent 4937bb17ad
commit 292d97ba7c
7 changed files with 378 additions and 172 deletions
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9
fullstack/freertos-wolfip-wolfmqtt/CMakeLists.txt
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@ -124,14 +124,16 @@ set(WOLFIP_SRC
${CMAKE_CURRENT_SOURCE_DIR}/src/wolfip_stub.c
)
# wolfMQTT source files - use stub implementation
set(WOLFMQTT_SRC
${CMAKE_CURRENT_SOURCE_DIR}/src/wolfmqtt_stub.c
)
# Application source files
set(APP_SRC
src/main.c
src/wolfip_freertos.c
src/mqtt_client.c
src/mqtt_net.c
src/wolfip_utils.c
src/wolfmqtt_stub.c
src/tap_interface.c
${CMAKE_CURRENT_SOURCE_DIR}/freertos/utils/posix_utils.c
)
@ -164,6 +166,7 @@ target_compile_options(wolfip PRIVATE
add_executable(freertos_sim
${FREERTOS_SRC}
${APP_SRC}
${WOLFMQTT_SRC}
)
# Link libraries

9
fullstack/freertos-wolfip-wolfmqtt/include/mqtt_config.h
View File

@ -34,7 +34,14 @@
#define MQTT_HOST "10.10.0.1"
#define MQTT_PORT 8883
#define MQTT_TOPIC "test/topic"
#define MQTT_QOS 0
#define MQTT_QOS 1
#define MQTT_CLIENT_ID "wolfMQTT-client"
#define MQTT_KEEP_ALIVE_SEC 60
#define MQTT_USERNAME NULL
#define MQTT_PASSWORD NULL
/* MQTT Timeouts */
#define MQTT_CON_TIMEOUT_MS 5000
#define MQTT_CMD_TIMEOUT_MS 5000
#endif /* MQTT_CONFIG_H */

43
fullstack/freertos-wolfip-wolfmqtt/src/main.c
View File

@ -39,7 +39,7 @@
/* Application includes */
#include "wolfip_freertos.h"
#include "mqtt_client.h"
#include "wolfmqtt_stub.h"
/* Task priorities */
#define WOLFIP_TASK_PRIORITY (tskIDLE_PRIORITY + 2)
@ -80,6 +80,9 @@ static void wolfip_task(void *pvParameters)
/* MQTT client task */
static void mqtt_task(void *pvParameters)
{
int rc;
MqttClientContext *mqttCtx;
(void)pvParameters;
printf("MQTT task started\n");
@ -87,9 +90,41 @@ static void mqtt_task(void *pvParameters)
/* Wait for wolfIP to initialize */
vTaskDelay(pdMS_TO_TICKS(1000));
/* Initialize and start MQTT client */
mqtt_client_init();
/* Initialize MQTT client */
rc = mqtt_client_init();
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to initialize MQTT client: %d\n", rc);
vTaskDelete(NULL);
return;
}
/* Get MQTT client context */
mqttCtx = mqtt_client_get_context();
/* Process messages */
printf("Waiting for MQTT messages...\n");
while (1) {
/* Process messages */
rc = mqtt_client_process_message();
if (rc != MQTT_CODE_SUCCESS) {
printf("MQTT message processing error: %d\n", rc);
break;
}
/* Send ping to keep connection alive */
rc = mqtt_client_ping();
if (rc != MQTT_CODE_SUCCESS) {
printf("MQTT ping failed: %d\n", rc);
break;
}
/* Sleep to prevent CPU hogging */
vTaskDelay(pdMS_TO_TICKS(100));
}
/* Cleanup MQTT client */
mqtt_client_cleanup();
/* Task complete */
vTaskDelete(NULL);
}

192
fullstack/freertos-wolfip-wolfmqtt/src/mqtt_client.c
View File

@ -25,44 +25,184 @@
#include <unistd.h>
#include <time.h>
#include "wolfip_freertos.h"
#include "wolfmqtt_stub.h"
#include "mqtt_client.h"
#include "../include/mqtt_config.h"
/* Buffer sizes */
#define MAX_BUFFER_SIZE 1024
#define PRINT_BUFFER_SIZE 80
/* Global MQTT client context */
static MqttClientContext mqttCtx;
/* MQTT message callback */
static void mqtt_message_cb(const char *topic, const char *payload, size_t payload_len)
static int mqtt_message_cb(MqttClient *client, MqttMessage *message,
byte msg_new, byte msg_done)
{
char buf[1024]; /* Buffer for message handling */
size_t len;
char buf[PRINT_BUFFER_SIZE+1];
word32 len;
/* Print incoming message */
printf("MQTT Message: Topic %s, Len %zu\n", topic, payload_len);
if (msg_new) {
/* Determine min size to dump */
len = message->topic_name_len;
if (len > PRINT_BUFFER_SIZE) {
len = PRINT_BUFFER_SIZE;
}
memcpy(buf, message->topic_name, len);
buf[len] = '\0'; /* Make sure it's null terminated */
printf("MQTT Message: Topic %s, Qos %d, Len %u\n",
buf, message->qos, message->total_len);
}
/* Print message payload */
len = payload_len;
if (len > sizeof(buf) - 1) {
len = sizeof(buf) - 1;
len = message->buffer_len;
if (len > PRINT_BUFFER_SIZE) {
len = PRINT_BUFFER_SIZE;
}
memcpy(buf, payload, len);
buf[len] = '\0'; /* Null terminate */
printf("Payload: %s\n", buf);
memcpy(buf, message->buffer, len);
buf[len] = '\0'; /* Make sure it's null terminated */
printf("Payload (%d - %d): %s\n",
message->buffer_pos, message->buffer_pos + message->buffer_len, buf);
if (msg_done) {
printf("MQTT Message: Done\n");
}
return MQTT_CODE_SUCCESS;
}
/* Initialize MQTT client */
int mqtt_client_init(void)
{
printf("MQTT client initialization stub\n");
printf("This is a placeholder for the actual MQTT client implementation\n");
printf("The real implementation would connect to the broker at %s:%d\n",
MQTT_HOST, MQTT_PORT);
/* In a real implementation, we would:
* 1. Initialize network connection
* 2. Establish TLS connection
* 3. Connect to MQTT broker
* 4. Subscribe to topics
* 5. Publish messages
* 6. Process incoming messages
*/
return 0;
int rc;
MqttConnect connect;
MqttSubscribe subscribe;
MqttTopic topics[1];
MqttPublish publish;
const char *message = "Hello from wolfMQTT FreeRTOS client!";
printf("MQTT Client Initialization\n");
/* Initialize network callbacks */
rc = mqtt_net_init(&mqttCtx.net);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to initialize MQTT network: %d\n", rc);
return rc;
}
/* Allocate buffers */
mqttCtx.tx_buf = (byte*)malloc(MAX_BUFFER_SIZE);
mqttCtx.rx_buf = (byte*)malloc(MAX_BUFFER_SIZE);
if (mqttCtx.tx_buf == NULL || mqttCtx.rx_buf == NULL) {
printf("Failed to allocate buffers\n");
mqtt_client_cleanup();
return MQTT_CODE_ERROR_MEMORY;
}
/* Initialize MQTT client */
rc = MqttClient_Init(&mqttCtx.client, &mqttCtx.net, mqtt_message_cb,
mqttCtx.tx_buf, MAX_BUFFER_SIZE,
mqttCtx.rx_buf, MAX_BUFFER_SIZE,
MQTT_DEFAULT_CMD_TIMEOUT_MS);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to initialize MQTT client: %d\n", rc);
mqtt_client_cleanup();
return rc;
}
/* Connect to broker */
printf("Connecting to MQTT broker at %s:%d\n", MQTT_HOST, MQTT_PORT);
rc = MqttClient_NetConnect(&mqttCtx.client, MQTT_HOST, MQTT_PORT,
MQTT_DEFAULT_CMD_TIMEOUT_MS, 1, NULL);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to connect to MQTT broker: %d\n", rc);
mqtt_client_cleanup();
return rc;
}
/* Build connect packet */
memset(&connect, 0, sizeof(MqttConnect));
connect.keep_alive_sec = MQTT_KEEP_ALIVE_SEC;
connect.clean_session = 1;
connect.client_id = MQTT_CLIENT_ID;
/* Send Connect and wait for Connect Ack */
rc = MqttClient_Connect(&mqttCtx.client, &connect);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to send MQTT connect: %d\n", rc);
mqtt_client_cleanup();
return rc;
}
/* Subscribe to topic */
memset(&subscribe, 0, sizeof(MqttSubscribe));
subscribe.packet_id = 1;
subscribe.topic_count = 1;
subscribe.topics = topics;
topics[0].topic_filter = MQTT_TOPIC;
topics[0].qos = MQTT_QOS;
rc = MqttClient_Subscribe(&mqttCtx.client, &subscribe);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to subscribe to topic: %d\n", rc);
mqtt_client_cleanup();
return rc;
}
/* Publish message */
memset(&publish, 0, sizeof(MqttPublish));
publish.retain = 0;
publish.qos = MQTT_QOS;
publish.duplicate = 0;
publish.topic_name = MQTT_TOPIC;
publish.packet_id = 2;
publish.buffer = (byte*)message;
publish.total_len = (word16)strlen(message);
rc = MqttClient_Publish(&mqttCtx.client, &publish);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to publish message: %d\n", rc);
mqtt_client_cleanup();
return rc;
}
printf("MQTT client initialized successfully\n");
return MQTT_CODE_SUCCESS;
}
/* Cleanup MQTT client */
int mqtt_client_cleanup(void)
{
int rc = MQTT_CODE_SUCCESS;
/* Disconnect from broker */
if (mqttCtx.client.flags & MQTT_CLIENT_FLAG_IS_CONNECTED) {
rc = MqttClient_Disconnect(&mqttCtx.client);
if (rc != MQTT_CODE_SUCCESS) {
printf("Failed to disconnect MQTT client: %d\n", rc);
}
}
/* Cleanup network */
MqttClient_NetDisconnect(&mqttCtx.client);
/* Free resources */
if (mqttCtx.tx_buf) {
free(mqttCtx.tx_buf);
mqttCtx.tx_buf = NULL;
}
if (mqttCtx.rx_buf) {
free(mqttCtx.rx_buf);
mqttCtx.rx_buf = NULL;
}
return rc;
}
/* Get MQTT client context */
MqttClientContext* mqtt_client_get_context(void)
{
return &mqttCtx;
}

22
fullstack/freertos-wolfip-wolfmqtt/src/mqtt_client.h
View File

@ -22,6 +22,13 @@
#ifndef MQTT_CLIENT_H
#define MQTT_CLIENT_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wolfmqtt/mqtt_client.h>
#include "mqtt_net.h"
#include "../include/mqtt_config.h"
/* MQTT broker settings */
#define MQTT_HOST "10.10.0.1"
#define MQTT_PORT 8883
@ -31,7 +38,20 @@
#define MQTT_KEEP_ALIVE_SEC 60
#define MQTT_DEFAULT_CMD_TIMEOUT_MS 30000
/* Initialize MQTT client */
/* MQTT Client context */
typedef struct MqttClientContext {
MqttClient client;
MqttNet net;
byte *tx_buf;
byte *rx_buf;
int socket_fd;
} MqttClientContext;
/* Function prototypes */
int mqtt_client_init(void);
int mqtt_client_cleanup(void);
/* External access to MQTT client context */
MqttClientContext* mqtt_client_get_context(void);
#endif /* MQTT_CLIENT_H */

175
fullstack/freertos-wolfip-wolfmqtt/src/wolfmqtt_stub.c
View File

@ -22,78 +22,133 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <wolfssl/ssl.h>
#include "wolfmqtt_stub.h"
/* MQTT client context */
static MqttClientContext mqttCtx;
/* Initialize MQTT client */
int MqttClient_Init(MqttClient *client, MqttNet *net, MqttMsgCb msg_cb,
byte *tx_buf, int tx_buf_len, byte *rx_buf, int rx_buf_len,
int cmd_timeout_ms)
int mqtt_client_init(void)
{
printf("MqttClient_Init stub called\n");
(void)client;
(void)net;
(void)msg_cb;
(void)tx_buf;
(void)tx_buf_len;
(void)rx_buf;
(void)rx_buf_len;
(void)cmd_timeout_ms;
return MQTT_CODE_SUCCESS;
}
/* Connect to MQTT broker */
int MqttClient_Connect(MqttClient *client, MqttConnect *connect)
{
printf("MqttClient_Connect stub called\n");
printf(" Client ID: %s\n", connect->client_id);
printf(" Keep Alive: %d seconds\n", connect->keep_alive_sec);
printf(" Clean Session: %d\n", connect->clean_session);
(void)client;
return MQTT_CODE_SUCCESS;
}
/* Subscribe to MQTT topic */
int MqttClient_Subscribe(MqttClient *client, MqttSubscribe *subscribe)
{
printf("MqttClient_Subscribe stub called\n");
printf(" Packet ID: %d\n", subscribe->packet_id);
printf(" Topic Count: %d\n", subscribe->topic_count);
for (int i = 0; i < subscribe->topic_count; i++) {
printf(" Topic %d: %s (QoS %d)\n", i,
subscribe->topics[i].topic_filter,
subscribe->topics[i].qos);
printf("Initializing MQTT client (stub implementation)\n");
/* Initialize context */
memset(&mqttCtx, 0, sizeof(MqttClientContext));
/* Allocate buffers */
mqttCtx.tx_buf = (unsigned char*)malloc(MAX_BUFFER_SIZE);
mqttCtx.rx_buf = (unsigned char*)malloc(MAX_BUFFER_SIZE);
if (mqttCtx.tx_buf == NULL || mqttCtx.rx_buf == NULL) {
printf("Failed to allocate buffers\n");
mqtt_client_cleanup();
return -1;
}
(void)client;
return MQTT_CODE_SUCCESS;
/* Connect to broker */
printf("Connecting to MQTT broker %s:%d\n", MQTT_HOST, MQTT_PORT);
/* Create TLS connection */
printf("Creating TLS connection\n");
/* Initialize wolfSSL */
if (wolfSSL_Init() != WOLFSSL_SUCCESS) {
printf("Failed to initialize wolfSSL\n");
return -1;
}
/* Create and initialize WOLFSSL_CTX */
WOLFSSL_CTX* ctx = wolfSSL_CTX_new(wolfTLSv1_3_client_method());
if (ctx == NULL) {
printf("Failed to create WOLFSSL_CTX\n");
return -1;
}
/* Load CA certificate */
if (wolfSSL_CTX_load_verify_locations(ctx, MQTT_TLS_CA_CERT, NULL) != WOLFSSL_SUCCESS) {
printf("Failed to load CA certificate: %s\n", MQTT_TLS_CA_CERT);
wolfSSL_CTX_free(ctx);
return -1;
}
/* Load client certificate */
if (wolfSSL_CTX_use_certificate_file(ctx, MQTT_TLS_CLIENT_CERT, WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
printf("Failed to load client certificate: %s\n", MQTT_TLS_CLIENT_CERT);
wolfSSL_CTX_free(ctx);
return -1;
}
/* Load client key */
if (wolfSSL_CTX_use_PrivateKey_file(ctx, MQTT_TLS_CLIENT_KEY, WOLFSSL_FILETYPE_PEM) != WOLFSSL_SUCCESS) {
printf("Failed to load client key: %s\n", MQTT_TLS_CLIENT_KEY);
wolfSSL_CTX_free(ctx);
return -1;
}
/* Store context */
mqttCtx.ssl_ctx = ctx;
/* Subscribe to topic */
printf("Subscribing to topic: %s\n", MQTT_TOPIC);
/* Publish test message */
printf("Publishing test message to topic: %s\n", MQTT_TOPIC);
return 0;
}
/* Publish MQTT message */
int MqttClient_Publish(MqttClient *client, MqttPublish *publish)
/* Cleanup MQTT client */
int mqtt_client_cleanup(void)
{
printf("MqttClient_Publish stub called\n");
printf(" Packet ID: %d\n", publish->packet_id);
printf(" Topic: %s\n", publish->topic_name);
printf(" QoS: %d\n", publish->qos);
printf(" Retain: %d\n", publish->retain);
printf(" Duplicate: %d\n", publish->duplicate);
printf(" Message: %.*s\n", (int)publish->total_len, publish->buffer);
(void)client;
return MQTT_CODE_SUCCESS;
printf("Cleaning up MQTT client (stub implementation)\n");
/* Free SSL context */
if (mqttCtx.ssl_ctx) {
wolfSSL_CTX_free(mqttCtx.ssl_ctx);
mqttCtx.ssl_ctx = NULL;
}
/* Free buffers */
if (mqttCtx.tx_buf) {
free(mqttCtx.tx_buf);
mqttCtx.tx_buf = NULL;
}
if (mqttCtx.rx_buf) {
free(mqttCtx.rx_buf);
mqttCtx.rx_buf = NULL;
}
/* Cleanup wolfSSL */
wolfSSL_Cleanup();
return 0;
}
/* Wait for MQTT message */
int MqttClient_WaitMessage(MqttClient *client, int timeout_ms)
/* Get MQTT client context */
MqttClientContext* mqtt_client_get_context(void)
{
(void)client;
(void)timeout_ms;
/* Simulate timeout */
return MQTT_CODE_ERROR_TIMEOUT;
return &mqttCtx;
}
/* Disconnect from MQTT broker */
int MqttClient_Disconnect(MqttClient *client)
/* Process MQTT messages */
int mqtt_client_process_message(void)
{
printf("MqttClient_Disconnect stub called\n");
(void)client;
return MQTT_CODE_SUCCESS;
printf("Processing MQTT messages (stub implementation)\n");
/* Simulate message processing */
sleep(1);
return 0;
}
/* Send MQTT ping */
int mqtt_client_ping(void)
{
printf("Sending MQTT ping (stub implementation)\n");
return 0;
}

100
fullstack/freertos-wolfip-wolfmqtt/src/wolfmqtt_stub.h
View File

@ -22,90 +22,36 @@
#ifndef WOLFMQTT_STUB_H
#define WOLFMQTT_STUB_H
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wolfssl/ssl.h>
#include "../include/mqtt_config.h"
/* Basic types */
typedef unsigned char byte;
typedef uint16_t word16;
typedef uint32_t word32;
/* Buffer sizes */
#define MAX_BUFFER_SIZE 1024
#define PRINT_BUFFER_SIZE 80
/* Return codes */
/* MQTT return codes */
#define MQTT_CODE_SUCCESS 0
#define MQTT_CODE_ERROR_TIMEOUT -1
#define MQTT_CODE_ERROR_NETWORK -2
#define MQTT_CODE_ERROR_MEMORY -3
/* MQTT Client */
typedef struct _MqttClient {
void *ctx;
} MqttClient;
/* MQTT Message */
typedef struct _MqttMessage {
const char *topic_name;
uint16_t topic_name_len;
byte qos;
uint32_t total_len;
byte *buffer;
uint32_t buffer_len;
} MqttMessage;
/* MQTT Connect */
typedef struct _MqttConnect {
const char *client_id;
uint16_t keep_alive_sec;
byte clean_session;
} MqttConnect;
/* MQTT Topic */
typedef struct _MqttTopic {
const char *topic_filter;
byte qos;
} MqttTopic;
/* MQTT Subscribe */
typedef struct _MqttSubscribe {
uint16_t packet_id;
uint16_t topic_count;
MqttTopic *topics;
} MqttSubscribe;
/* MQTT Publish */
typedef struct _MqttPublish {
uint16_t packet_id;
const char *topic_name;
byte *buffer;
uint32_t total_len;
byte qos;
byte retain;
byte duplicate;
} MqttPublish;
/* MQTT Network Callbacks */
typedef int (*MqttNetConnectCb)(void *context, const char *host, word16 port, int timeout_ms);
typedef int (*MqttNetReadCb)(void *context, byte *buf, int buf_len, int timeout_ms);
typedef int (*MqttNetWriteCb)(void *context, const byte *buf, int buf_len, int timeout_ms);
typedef int (*MqttNetDisconnectCb)(void *context);
/* MQTT Network */
typedef struct _MqttNet {
void *context;
MqttNetConnectCb connect;
MqttNetReadCb read;
MqttNetWriteCb write;
MqttNetDisconnectCb disconnect;
} MqttNet;
/* MQTT Message Callback */
typedef int (*MqttMsgCb)(MqttClient *client, MqttMessage *msg, byte msg_new, byte msg_done);
/* MQTT client context */
typedef struct MqttClientContext {
unsigned char *tx_buf;
unsigned char *rx_buf;
int socket_fd;
WOLFSSL_CTX *ssl_ctx;
WOLFSSL *ssl;
} MqttClientContext;
/* Function prototypes */
int MqttClient_Init(MqttClient *client, MqttNet *net, MqttMsgCb msg_cb,
byte *tx_buf, int tx_buf_len, byte *rx_buf, int rx_buf_len,
int cmd_timeout_ms);
int MqttClient_Connect(MqttClient *client, MqttConnect *connect);
int MqttClient_Subscribe(MqttClient *client, MqttSubscribe *subscribe);
int MqttClient_Publish(MqttClient *client, MqttPublish *publish);
int MqttClient_WaitMessage(MqttClient *client, int timeout_ms);
int MqttClient_Disconnect(MqttClient *client);
int mqtt_client_init(void);
int mqtt_client_cleanup(void);
MqttClientContext* mqtt_client_get_context(void);
int mqtt_client_process_message(void);
int mqtt_client_ping(void);
#endif /* WOLFMQTT_STUB_H */