raspberrypi: implement ping of string address

Author: jepler

ports/raspberrypi/common-hal/wifi/Radio.c

@@ -486,7 +486,11 @@ ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *addr)
 mp_int_t common_hal_wifi_radio_ping(wifi_radio_obj_t *self, mp_obj_t ip_address, mp_float_t timeout) {
     ping_time = sys_now();
     ip_addr_t ping_addr;
-    ipaddress_ipaddress_to_lwip(ip_address, &ping_addr);
+    if (mp_obj_is_str(ip_address)) {
+        socketpool_resolve_host_raise(mp_obj_str_get_str(ip_address), &ping_addr);
+    } else {
+        ipaddress_ipaddress_to_lwip(ip_address, &ping_addr);
+    }
 
     struct raw_pcb *ping_pcb;
     MICROPY_PY_LWIP_ENTER