From 0757e019f446bc1ee0b5f320ca0be53683456837 Mon Sep 17 00:00:00 2001 From: Anurag Kar Date: Mon, 29 Apr 2019 18:46:20 +0530 Subject: [PATCH] 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 https://github.com/espressif/esp-idf/issues/3381 --- components/esp_http_server/src/httpd_main.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/components/esp_http_server/src/httpd_main.c b/components/esp_http_server/src/httpd_main.c index d361bfee6..e19ac9af5 100644 --- a/components/esp_http_server/src/httpd_main.c +++ b/components/esp_http_server/src/httpd_main.c @@ -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);