General discussion • MQTT with lwip instable?

Code:

void __attribute__((noreturn)) __weak _exit(__unused int status) {#if PICO_ENTER_USB_BOOT_ON_EXIT    reset_usb_boot(0,0);#else    while (1) {        __breakpoint();    }#endif}

Code:

#include <stdio.h>#include "pico/stdlib.h"#include "hardware/adc.h"#include "pico/cyw43_arch.h"#include "lwip/apps/mqtt.h"#include "pico/binary_info.h"#define WIFI_SSID "ssid"#define WIFI_PASSWORD "password"int count = 0;//#define MQTT_PORT 1883int mqtt_status = 0;bool reserved_addr(uint8_t addr) {    return (addr & 0x78) == 0 || (addr & 0x78) == 0x78;}static void incoming_publish_cb(void *arg, const char *topic, u32_t tot_len){    printf("Topic %s, length: %d\n", topic, tot_len);}static void incoming_data_cb(void *arg, const u8_t *data, u16_t len, u8_t flags){    char *payload = (char *)data;    printf("payload\n%.*s\n", len, payload);}static void pub_request_cb(void *arg, err_t result){    printf("Publish result %d\n", result);    mqtt_client_t *client = (mqtt_client_t *)arg;}/* Called when publish is complete either with sucess or failure */static void mqtt_pub_request_cb(void *arg, err_t result){  if(result != ERR_OK) {    printf("Publish result: %d\n", result);  }}static void sub_request_cb(void *arg, err_t result){  /* Just print the result code here for simplicity,      normal behaviour would be to take some action if subscribe fails like      notifying user, retry subscribe or disconnect from server */  printf("Subscribe result: %d\n", result);}static void mqtt_connection_cb(mqtt_client_t *client, void *arg, mqtt_connection_status_t status) {  if (status == MQTT_CONNECT_ACCEPTED) {    printf("MQTT_CONNECT_ACCEPTED");    mqtt_status = 2;  }}int main(){    stdio_init_all();    ip_addr_t addr;    if (!ip4addr_aton("192.168.2.227", &addr)) {        printf("ip error\n");    }    else {        if (cyw43_arch_init()) {            printf("failed to initialise\n");        }        else {            cyw43_arch_enable_sta_mode();            if (cyw43_arch_wifi_connect_timeout_ms(WIFI_SSID, WIFI_PASSWORD, CYW43_AUTH_WPA2_AES_PSK, 30000)) {                printf("failed to connect\n");            } else {                printf("connected\n");                mqtt_client_t *client = mqtt_client_new();                struct mqtt_connect_client_info_t ci;                memset(&ci, 0, sizeof(ci));                ci.client_id = "MyPicoW";                ci.keep_alive = 10;                if ( mqtt_client_connect(client, &addr, 1883, mqtt_connection_cb, 0, &ci) == ERR_OK) {                    u8_t qos;                    u8_t retain;                    err_t err3;                    while (true)                    {                           switch (mqtt_status)                        {                            case 0: break;                            case 1: {                                mqtt_set_inpub_callback(client, incoming_publish_cb, incoming_data_cb, NULL);                                err_t err2 = mqtt_subscribe(client, "test", 1, sub_request_cb, NULL);                                break;                            }                            case 2:{                                qos = 2;                                retain = 0;                                err3 = mqtt_publish(client, "test", "test002", 7, qos, retain, pub_request_cb, client);                                break;                            }                            default:{                            printf("State: %d", mqtt_status);                            }                        }                        sleep_ms(100);                        count += 1;                    }                }                else {                    printf("MQTT connection error.");                }            }        }    }}