feat(tcpclient): reconnect and handle network exceptions

main/main.cpp

@@ -168,7 +168,7 @@ extern "C" void app_main() {
     mesh_main();
 
     // tcp client
-    //start_tcp_client();
+    tcp_client_initialize();
 
     // Arduino-like setup()
 

main/main.h

@@ -13,10 +13,10 @@
 
 // change these
 static const uint8_t MESH_ID[6] = { 0x77, 0x77, 0x77, 0x77, 0x77, 0x76 };
-//#define CONFIG_MESH_ROUTER_SSID "FBK_the_cutest_fox"
+#define CONFIG_MESH_ROUTER_SSID "FBK_the_cutest_fox"
-//#define CONFIG_MESH_ROUTER_PASSWD "zsfv3210"
+#define CONFIG_MESH_ROUTER_PASSWD "zsfv3210"
-#define CONFIG_MESH_ROUTER_SSID "FastCyberRoom"
+//#define CONFIG_MESH_ROUTER_SSID "FastCyberRoom"
-#define CONFIG_MESH_ROUTER_PASSWD "dyes1107@"
+//#define CONFIG_MESH_ROUTER_PASSWD "dyes1107@"
 #define CONFIG_MESH_AP_AUTHMODE WIFI_AUTH_WPA2_PSK
 #define CONFIG_MESH_AP_PASSWD "RASRASRAS"
 #define CONFIG_MESH_AP_CONNECTIONS 6 // number of nodes

main/tcphelper.c

@@ -106,14 +106,26 @@ static int socket_send(const char *tag, const int sock, const char * data, const
     return len;
 }
 
+// variables
+static const char *TAG = "nonblocking-socket-client";
+
+SemaphoreHandle_t lock = NULL;
+TaskHandle_t *task_handle = NULL;
+
+// tcp client
+void tcp_client_initialize() {
+    lock = xSemaphoreCreateMutex();
+
+    return;
+}
+
 static void tcp_client_task(void *pvParameters)
 {
-    static const char *TAG = "nonblocking-socket-client";
     static char rx_buffer[CONFIG_TCP_RXBUFFER_SIZE];
+    int sock = INVALID_SOCK;
 
     struct addrinfo hints = { .ai_socktype = SOCK_STREAM };
     struct addrinfo *address_info;
-    int sock = INVALID_SOCK;
 
     int res = getaddrinfo(CONFIG_TCP_SERVER_ADDRESS, CONFIG_TCP_SERVER_PORT, &hints, &address_info);
     if (res != 0 || address_info == NULL) {
@@ -217,31 +229,33 @@ error:
         close(sock);
     }
     free(address_info);
+    
+    free(task_handle);
+    task_handle = NULL;
     vTaskDelete(NULL);
 }
 
-/**
- * @brief Returns the string representation of client's address (accepted on this server)
- */
-static inline char* get_clients_address(struct sockaddr_storage *source_addr)
-{
-    static char address_str[128];
-    char *res = NULL;
-    // Convert ip address to string
-    if (source_addr->ss_family == PF_INET) {
-        res = inet_ntoa_r(((struct sockaddr_in *)source_addr)->sin_addr, address_str, sizeof(address_str) - 1);
-    }
-#ifdef CONFIG_LWIP_IPV6
-    else if (source_addr->ss_family == PF_INET6) {
-        res = inet6_ntoa_r(((struct sockaddr_in6 *)source_addr)->sin6_addr, address_str, sizeof(address_str) - 1);
-    }
-#endif
-    if (!res) {
-        address_str[0] = '\0'; // Returns empty string if conversion didn't succeed
-    }
-    return address_str;
-}
-
 void start_tcp_client(void) {
-    xTaskCreate(tcp_client_task, "tcp_client", 4096, NULL, 5, NULL);
+    if (xSemaphoreTake(lock, 1000 / portTICK_PERIOD_MS) == false)
+    {
+        return;
+    }
+
+    // stop old task
+    if (task_handle) {
+        ESP_LOGI(TAG, "Detected old task, deleting...");
+
+        vTaskDelete(*task_handle);
+        free(task_handle);
+        task_handle = NULL;
+    }
+
+    // new task
+    task_handle = malloc(sizeof(TaskHandle_t));
+    memset(task_handle, 0, sizeof(TaskHandle_t));
+
+    xTaskCreate(tcp_client_task, "tcp_client", 4096, NULL, 5, task_handle);
+
+    xSemaphoreGive(lock);
+    return;
 }

main/tcphelper.h

@@ -5,6 +5,7 @@ extern "C" {
 #endif
 
 // functions
+void tcp_client_initialize(void);
 void start_tcp_client(void);
 
 #ifdef __cplusplus