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Hello,
I'm testing the MPack library in an ESP32-C3 microcontroller. Below the code I'm using for testing (I added the MPack functions in the app_main function):
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include "esp_wifi.h"
#include "esp_system.h"
#include "nvs_flash.h"
#include "esp_event.h"
#include "esp_netif.h"
#include "protocol_examples_common.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "lwip/sockets.h"
#include "lwip/dns.h"
#include "lwip/netdb.h"
#include "esp_log.h"
#include "mqtt_client.h"
#include "mpack.h"
void print_data(char [], size_t);
static const char *TAG = "MQTT_EXAMPLE";
static void log_error_if_nonzero(const char *message, int error_code)
{
if (error_code != 0) {
ESP_LOGE(TAG, "Last error %s: 0x%x", message, error_code);
}
}
/*
* @brief Event handler registered to receive MQTT events
*
* This function is called by the MQTT client event loop.
*
* @param handler_args user data registered to the event.
* @param base Event base for the handler(always MQTT Base in this example).
* @param event_id The id for the received event.
* @param event_data The data for the event, esp_mqtt_event_handle_t.
*/
static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_t event_id, void *event_data)
{
ESP_LOGD(TAG, "Event dispatched from event loop base=%s, event_id=%d", base, event_id);
esp_mqtt_event_handle_t event = event_data;
esp_mqtt_client_handle_t client = event->client;
int msg_id;
switch ((esp_mqtt_event_id_t)event_id) {
case MQTT_EVENT_CONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_CONNECTED");
msg_id = esp_mqtt_client_publish(client, "/topic/qos1", "data_3", 0, 1, 0);
ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_subscribe(client, "/topic/qos0", 0);
ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_subscribe(client, "/topic/qos1", 1);
ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
msg_id = esp_mqtt_client_unsubscribe(client, "/topic/qos1");
ESP_LOGI(TAG, "sent unsubscribe successful, msg_id=%d", msg_id);
break;
case MQTT_EVENT_DISCONNECTED:
ESP_LOGI(TAG, "MQTT_EVENT_DISCONNECTED");
break;
case MQTT_EVENT_SUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_SUBSCRIBED, msg_id=%d", event->msg_id);
msg_id = esp_mqtt_client_publish(client, "/topic/qos0", "data", 0, 0, 0);
ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
break;
case MQTT_EVENT_UNSUBSCRIBED:
ESP_LOGI(TAG, "MQTT_EVENT_UNSUBSCRIBED, msg_id=%d", event->msg_id);
break;
case MQTT_EVENT_PUBLISHED:
ESP_LOGI(TAG, "MQTT_EVENT_PUBLISHED, msg_id=%d", event->msg_id);
break;
case MQTT_EVENT_DATA:
ESP_LOGI(TAG, "MQTT_EVENT_DATA");
printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
printf("DATA=%.*s\r\n", event->data_len, event->data);
break;
case MQTT_EVENT_ERROR:
ESP_LOGI(TAG, "MQTT_EVENT_ERROR");
if (event->error_handle->error_type == MQTT_ERROR_TYPE_TCP_TRANSPORT) {
log_error_if_nonzero("reported from esp-tls", event->error_handle->esp_tls_last_esp_err);
log_error_if_nonzero("reported from tls stack", event->error_handle->esp_tls_stack_err);
log_error_if_nonzero("captured as transport's socket errno", event->error_handle->esp_transport_sock_errno);
ESP_LOGI(TAG, "Last errno string (%s)", strerror(event->error_handle->esp_transport_sock_errno));
}
break;
default:
ESP_LOGI(TAG, "Other event id:%d", event->event_id);
break;
}
}
static void mqtt_app_start(void)
{
esp_mqtt_client_config_t mqtt_cfg = {
.uri = CONFIG_BROKER_URL,
};
#if CONFIG_BROKER_URL_FROM_STDIN
char line[128];
if (strcmp(mqtt_cfg.uri, "FROM_STDIN") == 0) {
int count = 0;
printf("Please enter url of mqtt broker\n");
while (count < 128) {
int c = fgetc(stdin);
if (c == '\n') {
line[count] = '\0';
break;
} else if (c > 0 && c < 127) {
line[count] = c;
++count;
}
vTaskDelay(10 / portTICK_PERIOD_MS);
}
mqtt_cfg.uri = line;
printf("Broker url: %s\n", line);
} else {
ESP_LOGE(TAG, "Configuration mismatch: wrong broker url");
abort();
}
#endif /* CONFIG_BROKER_URL_FROM_STDIN */
esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_cfg);
/* The last argument may be used to pass data to the event handler, in this example mqtt_event_handler */
esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler, NULL);
esp_mqtt_client_start(client);
}
void app_main(void)
{
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
* Read "Establishing Wi-Fi or Ethernet Connection" section in
* examples/protocols/README.md for more information about this function.
*/
//ESP_ERROR_CHECK(example_connect());
mqtt_app_start();
// encode to memory buffer
char *data;
char data_r[256] = {0};
size_t size;
int len = 0;
mpack_writer_t writer;
mpack_writer_init_growable(&writer, &data, &size);
// write the example on the msgpack homepage
mpack_build_map(&writer);
mpack_write_cstr(&writer, "compact");
mpack_write_bool(&writer, true);
mpack_write_cstr(&writer, "schemaaaaa");
mpack_write_uint(&writer, 7);
mpack_complete_map(&writer);
len = writer.position;
printf("Print 1: %u %u\n", len, (*writer.end));
printf("Print 2: %u %u\n", data[1], data[2]);
// finish writing
if (mpack_writer_destroy(&writer) != mpack_ok) {
fprintf(stderr, "An error occurred encoding the data!\n");
return;
}
else
{
}
// use the data
free(data);
}
void print_data(char data_in[], size_t length)
{
for (size_t i = 0; i < length; i++)
{
printf("%X ", data_in[i]);
}
}
When I try to print the data in line printf("Print 2: %u %u\n", data[1], data[2]); I the microcontroller reboots:
Print 1: 0 249
Guru Meditation Error: Core 0 panic'ed (Load access fault). Exception was unhandled.
Stack dump detected
Core 0 register dump:
MEPC : 0x42007944 RA : 0x42007942 SP : 0x3fc91b90 GP : 0x3fc8be00
0x42007944: app_main at /home/msurca/esp/IoTliftv1_0_3/tcp/build/../main/app_main.c:196 (discriminator 2)
0x42007942: app_main at /home/msurca/esp/IoTliftv1_0_3/tcp/build/../main/app_main.c:196 (discriminator 2)
TP : 0x3fc7513c T0 : 0x4005890e T1 : 0x20000000 T2 : 0x3fc68a28
S0/FP : 0x00000000 S1 : 0x00000000 A0 : 0x0000000f A1 : 0x3fc917c8
A2 : 0x00000000 A3 : 0x00000001 A4 : 0x3fc8e000 A5 : 0x00000000
A6 : 0x42005cf4 A7 : 0x0000000a S2 : 0x00000000 S3 : 0x00000000
0x42005cf4: console_write at /home/msurca/esp/esp-idf/components/vfs/vfs_console.c:71
S4 : 0x00000000 S5 : 0x00000000 S6 : 0x00000000 S7 : 0x00000000
S8 : 0x00000000 S9 : 0x00000000 S10 : 0x00000000 S11 : 0x00000000
T3 : 0x00000000 T4 : 0x3ff00000 T5 : 0x00000000 T6 : 0x3fd34413
MSTATUS : 0x00001881 MTVEC : 0x40380001 MCAUSE : 0x00000005 MTVAL : 0x00000002
0x40380001: _vector_table at ??:?
MHARTID : 0x00000000
Backtrace:
0x42007944 in app_main () at ../main/app_main.c:196
196 printf("Print 2: %u %u\n", data[1], data[2]);
#0 0x42007944 in app_main () at ../main/app_main.c:196
#1 0x4205e806 in main_task (args=<optimized out>) at /home/msurca/esp/esp-idf/components/freertos/FreeRTOS-Kernel/portable/port_common.c:124
#2 0x40387226 in prvTaskExitError () at /home/msurca/esp/esp-idf/components/freertos/FreeRTOS-Kernel/portable/riscv/port.c:132
Backtrace stopped: frame did not save the PC
ELF file SHA256: a7c731be59522570
Rebooting...
Also, if I change the content of "schema" by "schema12345" the end of the string is also 249. So, I am not sure if this is the function I should use to get the length of the data in the buffer. If I use the mpack_writer_buffer_used function the length I always get is 0.
Finally, if I comment the line mpack_write_cstr(&writer, "compact"); the program crashes and the microcontroller restarts. If the line mpack_build_map(&writer); is followed by the function mpack_write_cstr the program can be executed without crashing.
Which could be the reason of these problems?
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