Add Local SAP Announcement. Test w/ VLC.

tests/test_sap.py

@@ -0,0 +1,57 @@
+import datetime
+import logging
+import socket
+import struct
+import time
+
+from src import iupy
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.DEBUG)
+    logger = logging.getLogger("iupy/test_sap")
+
+    myip = iupy.get_my_ip("172.30.0.141")
+
+    datetime_int = int(datetime.datetime.utcnow().timestamp())
+
+    session_info = "v=0\r\n" \
+                   "o=- {} {} IN IP4 172.30.0.141\r\n" \
+                   "s=4.1: WBZ-DT\r\n" \
+                   "i=DVBlast Video Network\r\n" \
+                   "c=IN IP4 239.255.1.1/255\r\n" \
+                   "t=0 0\r\n" \
+                   "a=recvonly\r\na=type:broadcast\r\n" \
+                   "a=source-filter: incl IN * 172.30.0.141\r\n" \
+                   "m=video 28001 udp mpeg\r\n".format(datetime_int, datetime_int)
+
+    sap_struct = iupy.sap_segment(version=1, src_ip_addr=myip, id_hash=2,
+                                  payload_type='application/sdp', payload=session_info)
+
+    if sap_struct is None:
+        print("Unable to build SAP Packet.  Check debug Logs.")
+        exit()
+
+    print("SAP Structure: ", ' '.join(hex(byte)[2:].zfill(2) for byte in sap_struct))
+
+    beaconSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+    beaconSocket.settimeout(0.2)
+    beaconSocket.setsockopt(socket.IPPROTO_IP, socket.SO_REUSEADDR, 1)
+    # beaconSocket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, socket.inet_aton(myip))
+    beaconSocket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, struct.pack('B', 16))
+
+    beaconDest = ('224.2.127.254', 9875)
+
+    done = False
+    i = 0
+    while not done:
+        beaconSocket.sendto(sap_struct, beaconDest)
+
+        time.sleep(5)
+
+        i += 1;
+        if i > 6:
+            done = True
+
+    beaconSocket.close()
+
+    print("SAP Complete")