feat: decode Config response in donglora.py, add all_commands.py example

Config response (GetConfig) now returns decoded RadioConfig fields instead
of raw hex. New all_commands.py exercises all 8 protocol commands in
sequence — Ping, SetConfig, GetConfig, StartRx, StopRx, Transmit,
DisplayOff, DisplayOn.

all_commands.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+"""Exercise every DongLoRa command to verify the API works.
+
+Usage:
+    uv run examples/all_commands.py [PORT]
+"""
+# /// script
+# requires-python = ">=3.10"
+# dependencies = ["cobs", "pyserial"]
+# ///
+
+import serial
+import sys
+
+sys.path.insert(0, __import__("pathlib").Path(__file__).parent.as_posix())
+import donglora as dl  # noqa: E402
+
+try:
+    ser = dl.connect(sys.argv[1] if len(sys.argv) > 1 else None)
+
+    print("── Ping ──")
+    print(dl.send(ser, "Ping"))
+
+    print("\n── SetConfig ──")
+    print(dl.send(ser, "SetConfig", config=dl.DEFAULT_CONFIG))
+
+    print("\n── GetConfig ──")
+    print(dl.send(ser, "GetConfig"))
+
+    print("\n── StartRx ──")
+    print(dl.send(ser, "StartRx"))
+
+    print("\n── StopRx ──")
+    print(dl.send(ser, "StopRx"))
+
+    print("\n── Transmit ──")
+    print(dl.send(ser, "Transmit", payload=b"Hello from all_commands.py!"))
+
+    print("\n── DisplayOff ──")
+    print(dl.send(ser, "DisplayOff"))
+
+    print("\n── DisplayOn ──")
+    print(dl.send(ser, "DisplayOn"))
+
+    print("\nAll 8 commands exercised successfully.")
+
+except KeyboardInterrupt:
+    print("\nInterrupted.")
+except serial.SerialException as e:
+    print(f"\nSerial error: {e}", file=sys.stderr)
+    sys.exit(1)

donglora.py

@@ -125,6 +125,11 @@ def decode_response(data: bytes) -> dict:
     if tag == 0:
         return {"type": "Pong"}
     elif tag == 1:
+        if len(rest) >= 10:
+            freq_hz, bw, sf, cr, sync_word, pwr = struct.unpack_from("<IBBBHB", rest, 0)
+            tx_power_dbm = struct.unpack_from("<b", rest, 9)[0]
+            return {"type": "Config", "freq_hz": freq_hz, "bw": bw, "sf": sf,
+                    "cr": cr, "sync_word": sync_word, "tx_power_dbm": tx_power_dbm}
         return {"type": "Config", "raw": rest.hex()}
     elif tag == 2:
         rssi = struct.unpack_from("<h", rest, 0)[0]