refactor: move transport configuration from frontend to backend

src/auracast/server/multicast_frontend.py

@@ -13,11 +13,7 @@ if 'stream_started' not in st.session_state:
 # Global: desired packetization time in ms for Opus (should match backend)
 PTIME = 40
 BACKEND_URL = "http://localhost:5000"
-#TRANSPORT1 = "serial:/dev/serial/by-id/usb-ZEPHYR_Zephyr_HCI_UART_sample_B53C372677E14460-if00,115200,rtscts"
-#TRANSPORT2 = "serial:/dev/serial/by-id/usb-ZEPHYR_Zephyr_HCI_UART_sample_CC69A2912F84AE5E-if00,115200,rtscts"
 
-TRANSPORT1 = 'serial:/dev/ttyAMA3,1000000,rtscts' # transport for raspberry pi gpio header
-TRANSPORT2 = 'serial:/dev/ttyAMA4,1000000,rtscts' # transport for raspberry pi gpio header
 QUALITY_MAP = {
     "High (48kHz)": {"rate": 48000, "octets": 120},
     "Good (32kHz)": {"rate": 32000, "octets": 80},
@@ -122,7 +118,7 @@ if audio_mode == "Demo":
         config1 = auracast_config.AuracastConfigGroup(
             auracast_sampling_rate_hz=q['rate'],
             octets_per_frame=q['octets'],
-            transport=TRANSPORT1,
+            transport='', # is set in backend
             bigs=bigs1
         )
         config2 = None
@@ -130,7 +126,7 @@ if audio_mode == "Demo":
             config2 = auracast_config.AuracastConfigGroup(
                 auracast_sampling_rate_hz=q['rate'],
                 octets_per_frame=q['octets'],
-                transport=TRANSPORT2,
+                transport='', # is set in backend
                 bigs=bigs2
             )
         # Call /init and /init2
@@ -331,7 +327,7 @@ else:
         config = auracast_config.AuracastConfigGroup(
             auracast_sampling_rate_hz=q['rate'],
             octets_per_frame=q['octets'],
-            transport=TRANSPORT1, # transport for raspberry pi gpio header
+            transport='', # is set in backend
             bigs = [
                 auracast_config.AuracastBigConfig(
                     code=(stream_passwort.strip() or None),