esp_http_server : Allow binding to same address and port upon restarting server without delay
Issue : Restarting the server without 30sec delay between httpd_stop() and httpd_start() causes EADDRINUSE error
Resolution : Use setsockopt() to enable SO_REUSEADDR on listener socket
Closes
@@ -254,6 +254,15 @@ static esp_err_t httpd_server_init(struct httpd_data *hd)
.sin6_port = htons(hd->config.server_port)
};
+ /* Enable SO_REUSEADDR to allow binding to the same
+ * address and port when restarting the server */
+ int enable = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
+ /* This will fail if CONFIG_LWIP_SO_REUSE is not enabled. But
+ * it does not affect the normal working of the HTTP Server */
+ ESP_LOGW(TAG, LOG_FMT("error enabling SO_REUSEADDR (%d)"), errno);
+ }
+
int ret = bind(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
if (ret < 0) {
ESP_LOGE(TAG, LOG_FMT("error in bind (%d)"), errno);
