superguardado: fixes pi_bot (offset persistente, unit systemd) + voz.py (desconectar chromecast) + lecciones 27-31

vigilancia/pi_bot.py

@@ -9,6 +9,7 @@ import requests
 
 BASE = os.path.dirname(os.path.abspath(__file__))
 LOG = os.path.join(BASE, "bot.log")
+OFFSET_FILE = os.path.join(BASE, "bot.offset")
 TV_API = "http://127.0.0.1:8600/tv/mensaje"
 
 
@@ -174,13 +175,29 @@ def monitor_temperatura():
                    f"(límite {ALERTA_TEMP}°C)\n{msg}", CHAT_ID)
 
 
+def cargar_offset():
+    try:
+        with open(OFFSET_FILE) as f:
+            return int(f.read().strip())
+    except Exception:
+        return None
+
+
+def guardar_offset(offset):
+    try:
+        with open(OFFSET_FILE, "w") as f:
+            f.write(str(offset))
+    except Exception:
+        pass
+
+
 def main():
     if not TOKEN:
         print("Falta TELEGRAM_TOKEN en .env")
         return
     threading.Thread(target=monitor_temperatura, daemon=True).start()
-    offset = None
-    log("Bot iniciado")
+    offset = cargar_offset()
+    log("Bot iniciado" + (f" (offset {offset})" if offset else ""))
     print("Bot iniciado. Esperando mensajes...")
     while True:
         try:
@@ -193,6 +210,7 @@ def main():
             ).json()
             for upd in r.get("result", []):
                 offset = upd["update_id"] + 1
+                guardar_offset(offset)
                 log(f"UPDATE {upd.get('update_id')}")
                 msg = upd.get("message") or upd.get("channel_post")
                 if not msg:

vigilancia/voz.py

@@ -231,6 +231,15 @@ def _url_silencio():
     return f"http://{_ip_lan()}:{config.GOOGLE_TV_PUERTO}/{os.path.basename(ruta)}"
 
 
+def _desconectar(chromecasts):
+    for cc in chromecasts:
+        try:
+            if cc.is_active and cc.is_connected:
+                cc.disconnect()
+        except Exception:
+            pass
+
+
 def _reproducir_y_esperar(c, url, content_type, titulo, desc):
     c.media_controller.play_media(url, content_type, title=titulo)
     print(f"[Voz] {desc}")
@@ -307,6 +316,7 @@ def anuncio_en_teles(texto):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error de casting: {e}")
@@ -358,6 +368,7 @@ def youtube_en_teles(url):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error YouTube: {e}")
@@ -414,6 +425,7 @@ def anuncio_simple(texto):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error de casting: {e}")