add dhcp_hostname config for esp32

Author: Andrey Hinkov

mos_esp32.yml

@@ -9,6 +9,7 @@ cdefs:
   MGOS_ETH_PHY_DP83848: 0
 
 config_schema:
+  - ["eth.dhcp_hostname", "s", {title: "Host name to include in DHCP requests"}]
   - ["eth.clk_mode", "i", 0, {title: "50 MHz clock source: 0 in <- GPIO0, 1 out -> GPIO0, 2 out -> GPIO16, 3 out -> GPIO17 (inverted)"}]
   - ["eth.mdc_gpio", "i", 23, {title: "GPIO to use for RMII MDC signal"}]
   - ["eth.mdio_gpio", "i", 18, {title: "GPIO to use for RMII MDIO signal"}]

src/esp32/esp32_eth.c

@@ -126,6 +126,14 @@ bool mgos_ethernet_init(void) {
     return false;
   }
 
+  if (mgos_sys_config_get_eth_dhcp_hostname() != NULL &&
+      esp_netif_set_hostname(esp_netif_get_handle_from_ifkey("ETH_DEF"),
+                             mgos_sys_config_get_eth_dhcp_hostname()) !=
+          ESP_OK) {
+    LOG(LL_ERROR, ("ETH: Failed to set host name"));
+    goto out;
+  }
+
   esp_event_handler_register(ETH_EVENT, ESP_EVENT_ANY_ID,
                              esp32_eth_event_handler, eth_if);
   esp_event_handler_register(IP_EVENT, IP_EVENT_ETH_GOT_IP,