use rpi gpi transport, set default log level do info

src/auracast/server/multicast_frontend.py

@@ -164,7 +164,7 @@ if audio_mode in ["Webapp", "USB"]:
         config = auracast_config.AuracastConfigGroup(
             auracast_sampling_rate_hz=q['rate'],
             octets_per_frame=q['octets'],
-            transport="auto",
+            transport='serial:/dev/ttyAMA3,1000000,rtscts', # transport for raspberry pi gpio header
             bigs = [
                 auracast_config.AuracastBigConfig(
                     name=stream_name,

src/auracast/server/multicast_server.py

@@ -363,8 +363,8 @@ async def shutdown():
 
 if __name__ == '__main__':
     import uvicorn
-    log.basicConfig(
-        level=os.environ.get('LOG_LEVEL', log.DEBUG),
+    log.basicConfig( # for debug log level export LOG_LEVEL=DEBUG
+        level=os.environ.get('LOG_LEVEL', log.INFO),
         format='%(module)s.py:%(lineno)d %(levelname)s: %(message)s'
     )
     uvicorn.run(app, host="0.0.0.0", port=5000)