iwd-wifi.bash: improve formatting, add note on dpp

bash/iwd-wifi.bash

@@ -17,6 +17,22 @@ iwctl station $WIFIDEVICE get-networks
 # The manpage says: iwctl --passphrase=PASSPHRASE station DEVICE connect SSID
 # but considering it says -P is shorthand for passphrase, I think this should
 # work too while being more logical in my opinion.
-echo "% sudo iwctl station $WIFIDEVICE connect \$SSID -P \$KEY"
-
+echo "To connect:
+% iwctl station $WIFIDEVICE connect \$SSID -P \$KEY
+"
 # For permanent connections https://gitea.blesmrt.net/mikaela/shell-things/src/branch/master/var/lib/iwd
+
+# Device Provisioning Protocol https://iwd.wiki.kernel.org/device_provisioning
+# requires qrencode, so let's check it exists
+if hash qrencode needrestart 2>/dev/null; then
+    # Remind of command to share
+    echo "To share credentials:
+% iwctl dpp $WIFIDEVICE start-configurator
+"
+    # It needs to be stopped too
+    echo "To stop sharing credentials:
+% iwctl dpp $WIFIDEVICE stop"
+# Remind me that this part exists if qrencode is not found.
+else
+    echo "WARNING! qrencode not found."
+fi