fix(examples): Timeout waiting for IP addresses in protocol_examples_…

…common

For example, in case a unique local address is preferred (via sdkconfig)
but not available on the network, this patch prevents initialisation
from hanging indefinitely.

Instead, we wait up to 10s for an IPv4 address and another 10s for the
preferred type of IPv6 address. In case of timeout, a warning is logged
and the program continues.

examples/common_components/protocol_examples_common/eth_connect.c

@@ -232,10 +232,14 @@ esp_err_t example_ethernet_connect(void)
     eth_start();
     ESP_LOGI(TAG, "Waiting for IP(s).");
 #if CONFIG_EXAMPLE_CONNECT_IPV4
-    xSemaphoreTake(s_semph_get_ip_addrs, portMAX_DELAY);
+    if (xSemaphoreTake(s_semph_get_ip_addrs, pdMS_TO_TICKS(10000)) == pdFALSE) {
+        ESP_LOGW(TAG, "Gave up waiting for IPv4 address.");
+    }
 #endif
 #if CONFIG_EXAMPLE_CONNECT_IPV6
-    xSemaphoreTake(s_semph_get_ip6_addrs, portMAX_DELAY);
+    if (xSemaphoreTake(s_semph_get_ip6_addrs, pdMS_TO_TICKS(10000)) == pdFALSE) {
+        ESP_LOGW(TAG, "Gave up waiting for (preferred) IPv6 address.");
+    }
 #endif
     return ESP_OK;
 }

examples/common_components/protocol_examples_common/wifi_connect.c

@@ -166,10 +166,14 @@ esp_err_t example_wifi_sta_do_connect(wifi_config_t wifi_config, bool wait)
     if (wait) {
         ESP_LOGI(TAG, "Waiting for IP(s)");
 #if CONFIG_EXAMPLE_CONNECT_IPV4
-        xSemaphoreTake(s_semph_get_ip_addrs, portMAX_DELAY);
+        if (xSemaphoreTake(s_semph_get_ip_addrs, pdMS_TO_TICKS(10000)) == pdFALSE) {
+            ESP_LOGW(TAG, "Gave up waiting for IPv4 address.");
+        }
 #endif
 #if CONFIG_EXAMPLE_CONNECT_IPV6
-        xSemaphoreTake(s_semph_get_ip6_addrs, portMAX_DELAY);
+        if (xSemaphoreTake(s_semph_get_ip6_addrs, pdMS_TO_TICKS(10000)) == pdFALSE) {
+            ESP_LOGW(TAG, "Gave up waiting for (preferred) IPv6 address.");
+        }
 #endif
         if (s_retry_num > CONFIG_EXAMPLE_WIFI_CONN_MAX_RETRY) {
             return ESP_FAIL;