[BUG] Caller should not connect to another Caller

[bpolic]

Describe the bug
Caller can be connected to another Caller!

Linux machine 1 IP: yy.yy.yy.yy
Linux machine 2 IP: xx.xx.xx.xx

To Reproduce
Steps to reproduce the behavior:

1. Use 2 Linux machines
2. Build a SRT Library
3. Run caller on first machine: ./srt-xtransmit receive "srt://xx.xx.xx.xx:4200?latency=500&bind=:4200" -v
4. Run caller on first machine: ./srt-xtransmit generate "srt://yy.yy.yy.yy:4200?latency=500&bind=:4200" -v --duration 20 --sendrate 5Mbps

Current behavior:
Caller can be connected to another Caller! Data transition will be interrupted before expected time in this case 20 sec. Connection will be closed before 20 sec

Expected behavior
Connection rejection

Desktop (please provide the following information):

• OS: Linux
• SRT Version 1.5.1

[bpolic]

Tested on latest master:
Inconsistent behavior, if we want to connect 2 caller, sometimes we have:

19:11:17.486855 [D] SOCKET::SRT 0x312615FF ASYNC Connecting to srt://10.129.10.81:4200
19:11:20.491838 [D] SOCKET::SRT 0x312615FF connect failed. ERROR: Connection timeout.
19:11:20.491980 [D] SOCKET::SRT 0x312615FF Releasing epolls before closing
19:11:20.492018 [D] SOCKET::SRT 0x312615FF Closing

sometimes:

[haivision@big-flop bin]$ ./srt-xtransmit generate "srt://10.129.10.81:4200?latency=500&bind=:4200" -v --duration 20 --sendrate 5Mbps
19:12:18.076715 [I] SOCKET::SRT srt://10.129.10.81:4200: bound to ':4200'.
19:12:18.076866 [D] SOCKET::SRT 0x3726BAFC ASYNC Connecting to srt://10.129.10.81:4200
19:12:18.078129 [D] SOCKET::SRT 0x3726BAFC ASYNC Connected to srt://10.129.10.81:4200
19:12:18.078177 [I] PACER sendrate 5000000 bps (inter send interval 2105 us)
19:12:19.078425 [I] GENERATE Sending at 4990 kbps
19:12:20.078550 [I] GENERATE Sending at 5000 kbps
19:12:21.078679 [I] GENERATE Sending at 5000 kbps
19:12:22.078789 [I] GENERATE Sending at 5000 kbps
19:12:23.078904 [I] GENERATE Sending at 5000 kbps
19:12:23.199022 [D] SOCKET::SRT 0x3726BAFC write::send. ERROR: Connection was broken.
19:12:23.199083 [W] GENERATE write::send: Connection was broken
19:12:23.199106 [D] SOCKET::SRT 0x3726BAFC Releasing epolls before closing
19:12:23.199132 [D] SOCKET::SRT 0x3726BAFC Closing

Maybe to reopen bug ticket?

[bpolic]

Retested after fix, working as expected now.