Sage Server Discovery for iPhone Remote

[bodagetta]

I have written a remote control app for the iPhone, but I would like to add auto-discovery of Sage Servers. Can someone direct me to the way that the placeshifter client does this?

[Fuzzy]

All I know is it uses port 31100 for the detection system. I'd assume it uses a EDP broadcast. Odds are you'll have to use a packet analyzer to determine what is actually passed.

[wayner]

Originally Posted by Fuzzy

Odds are you'll have to use a packet analyzer to determine what is actually passed.

Wireshark is useful for this - you can filter it for IP traffic to/from a specific IP to help to narrow down what you are looking for.

[dwalton22]

Several years ago I started working on a Sage client for xbox media center.
I never finished it but I did keep my notes. Here is what I have on server
discovery....you will notice that there are many many pieces I hadn't figured
out yet. Hope this helps.

Step 1 - Server Discovery
The application is launched (but we do not click "connect" yet) and the client
sends a broadcast packet to UDP port 31100 in an attempt to find any SageTV
servers on the LAN. The initial UDP source port is random, so far the lowest I
have seen is 1133 and the highest is 4429. The payload of this UDP packet is
32 bytes and the first four bytes are 0x53545601 but I have no idea what these
numbers mean. The remainder of the payload is all zeros:

0x53545601 0x00000000000000000000000000000000000000000000000000000000

The server responds with a payload of 15 bytes where the first four bytes are
0x53545602 which is the same as client payload except for a 2 at the end instead
of 1. The 5th byte is 0x01, not sure what this is used for. The next 8 bytes are the
Locator-ID while the remaining 2 bytes are the port number for the server (0x797b
is 31099):

0x53545602 0x01 0x3fd1d5d3a62b4c8f 0x797b

This discovery process repeats itself every 10 seconds until we proceed to Step 2,
the only delta is the UDP source port number which increments by one with each iteration.

Wireshark capture: step_1.pcap

Step 2 - Establish "Media" TCP connection to the server
We click "connect" and establish two TCP sessions to port 31099. The TCP source port
for the first session is random. The lowest source port I have seen is 1183, the highest
is 4434. Once the session is established the client will send two packets to the server.
The payload of the first packet is 7 bytes where the first byte is 0x01 and the remaining
6 bytes contain the MAC address of the client. The payload of the second packet is 1
byte and contains the value 0x01. The value 0x01 indicates to the server that this is the
"media" socket. The server should then respond with a 1 byte payload containing 0x02.
If the server responds with any other value then there has been an error and the session
should be torn down.

The rest can be found here:
http://sagetvplaceshifter.wikidot.co...ial-connection

[Addict]

Was this app ever done? Would LOVE this!

[tonysathre]

Originally Posted by Addict

Was this app ever done? Would LOVE this!

I second that.