feat: Join an existing WiFi network

Add ssid and passphrase to config to configure the network to join. If
empty SSID is configured, it will create the "TonberryPicoAP..." network
in AP mode as before.

Holding the button 1 during startup will revert to AP mode regardless of
the current configuration.

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

software/frontend/index.html

@@ -384,6 +384,12 @@
             'root.LED_COUNT': {
                 'input-type': 'number'
             },
+            'root.WLAN.SSID': {
+                'input-type': 'text'
+            },
+            'root.WLAN.PASSPHRASE': {
+                'input-type': 'text'
+            }
         };
     
         function renderObject(obj, path) {

software/src/main.py

@@ -37,14 +37,22 @@ hwconfig.board_init()
 machine.mem32[0x40030000 + 0x00] = 0x10
 
 
-def setup_wifi():
+def setup_wifi(ssid='', passphrase='', sec=network.WLAN.SEC_WPA2_WPA3):
     network.hostname("TonberryPico")
-    wlan = network.WLAN(network.WLAN.IF_AP)
-    wlan.config(ssid=f"TonberryPicoAP_{machine.unique_id().hex()}", security=wlan.SEC_OPEN)
-    wlan.active(True)
+    if ssid == '':
+        apname = f"TonberryPicoAP_{machine.unique_id().hex()}"
+        print(f"Create AP {apname}")
+        wlan = network.WLAN(network.WLAN.IF_AP)
+        wlan.config(ssid=apname, security=wlan.SEC_OPEN)
+        wlan.active(True)
+    else:
+        print(f"Connect to SSID {ssid} with passphrase {passphrase}...")
+        wlan = network.WLAN()
+        wlan.active(True)
+        wlan.connect(ssid, passphrase, security=sec)
 
-    # disable power management
-    wlan.config(pm=network.WLAN.PM_NONE)
+    # configure power management
+    wlan.config(pm=network.WLAN.PM_PERFORMANCE)
 
     mac = ubinascii.hexlify(network.WLAN().config('mac'), ':').decode()
     print(f"     mac: {mac}")
@@ -71,8 +79,11 @@ def run():
     # Setup LEDs
     np = NeoPixel(hwconfig.LED_DIN, config.get_led_count(), sm=1)
 
-    # Wifi with default config
-    setup_wifi()
+    if machine.Pin(hwconfig.BUTTONS[1], machine.Pin.IN, machine.Pin.PULL_UP).value() == 0:
+        # Force default access point
+        setup_wifi('', '')
+    else:
+        setup_wifi(config.get_wifi_ssid(), config.get_wifi_passphrase())
 
     # Setup MP3 player
     with SDContext(mosi=hwconfig.SD_DI, miso=hwconfig.SD_DO, sck=hwconfig.SD_SCK, ss=hwconfig.SD_CS,

software/src/utils/config.py

@@ -22,7 +22,11 @@ class Configuration:
             'PREV': None,
             'NEXT': 1,
         },
-        'TAGMODE': 'tagremains'
+        'TAGMODE': 'tagremains',
+        'WIFI': {
+            'SSID': '',
+            'PASSPHRASE': '',
+        }
     }
 
     def __init__(self, config_path='/config.json'):
@@ -87,6 +91,12 @@ class Configuration:
     def get_tagmode(self) -> str:
         return self._get('TAGMODE')
 
+    def get_wifi_ssid(self) -> str:
+        return self._get('WIFI')['SSID']
+
+    def get_wifi_passphrase(self) -> str:
+        return self._get('WIFI')['PASSPHRASE']
+
     # For the web API
     def get_config(self) -> Mapping[str, Any]:
         return self.config