How to Respond to SSDP Searches with Sockets in Python? -

i'm trying create chromecast device can stream video internet , remotely controlled. remote control http requests device , listen them following code:

listening http requests device (localhost):

import socket import sys  s = socket.socket()  host = "localhost"  port = 8060 s.bind(('', port)) s.listen(1) try:     while true:         connection, clientaddress = s.accept()         try:                 print clientaddress                 //do command                 //reply         except:                 print "error" except keyboardinterrupt:     print('interrupt') 

i went implement ssdp other devices can find device , cast , planning on using similar code listen msearch requests except on 239.255.255.250:1900. however, when msearch sent code not pick up.

listening ssdp searches on "239.255.255.250:1900"

import socket import sys  s = socket.socket() host = "239.255.255.250" port = 1900 s.bind((host, port)) s.listen(10) try:     while true:         connection, clientaddress = s.accept()         try:                 print("trigger")                 print clientaddress                 data = connection.recv(1048)                 print data         except:                 print "error" except keyboardinterrupt:     print('interrupt') 

the question:

so question why 2 acting differently (i believe because in first example device listening destination http requests whereas in second not) , way fix code can listen ssdp searches.

ssdp udp protocol, don't specify udp in socket constructor. using socket constructor no arguments,

s = socket.socket() 

you default arguments:

socket.socket(family=af_inet, type=sock_stream, proto=0, fileno=none)

as can see, default type sock_stream, i.e. tcp. instead, @ server() method in this example, of fragment is:

mcast_grp = '239.255.255.250' mcast_port = 1900  def server(timeout=5):      socket.setdefaulttimeout(timeout)      sock = socket.socket(socket.af_inet, socket.sock_dgram, socket.ipproto_udp)     sock.setsockopt(socket.sol_socket, socket.so_reuseaddr, 1)     sock.setsockopt(socket.ipproto_ip, socket.ip_multicast_ttl, 2)     sock.bind(('', mcast_port))      mreq = struct.pack('4sl', socket.inet_aton(mcast_grp), socket.inaddr_any)     sock.setsockopt(socket.ipproto_ip, socket.ip_add_membership, mreq)     # ... more code @ link 

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