dietpi: don't fail after testing wifi

less wait: change dhclient timeout 60s -> 30s

src/build_dist

@@ -141,6 +141,8 @@ EOF
 
     # reduce default networking timeout from 300 to 120 seconds for dietpi
     echo WAIT_ONLINE_TIMEOUT=120 >> "$MNT_DIR"/etc/default/networking
+    # reduce the timeout for acquiring a dhcp lease, this makes dietpi networking less painful (default 60s)
+    echo "timeout 30;" >> "$MNT_DIR"/etc/default/networking
 
     sed -i "s/ADSB_RANDOM_PASSWORD/$ROOT_PWD/" "${DIR}/variants/dietpi/dietpi.txt"
     echo "AUTO_SETUP_SSH_PUBKEY=$SSH_PUB_KEY" >> "${DIR}/variants/dietpi/dietpi.txt"

src/modules/adsb-feeder/filesystem/root/opt/adsb/adsb-setup/hotspot-app.py

@@ -378,6 +378,13 @@ def test_wifi(self):
                 capture_output=True,
             )
 
+            if success:
+                # this needs a long sleep so the networking actually works when we check it after exiting the hotspot app
+                # somehow on first boot, eth0 and wlan0 are checked sequentially instead of parallel
+                # thus we need to wait the dhclient.conf timeout which is 30 (modified, default is 60)
+                print_err(f"successfully connected to '{self.ssid}' but it's dietpi so we need to wait for networking to come up")
+                time.sleep(30)
+
         elif self._baseos == "raspbian":
             # try for a while because it takes a bit for NetworkManager to come back up
             startTime = time.time()