Create new torrent and seed

I'm using the following code to create a new torret and share but something is wrong because never seed.

import sys
import time
import libtorrent as lt

#Create torrent
fs = lt.file_storage()
lt.add_files(fs, "./test.txt")
t = lt.create_torrent(fs)
t.add_tracker("udp://tracker.openbittorrent.com:80/announce", 0)
t.set_creator('libtorrent %s' % lt.version)
t.set_comment("Test")
lt.set_piece_hashes(t, ".")
torrent = t.generate()    
f = open("mytorrent.torrent", "wb")
f.write(lt.bencode(torrent))
f.close()

#Seed torrent
ses = lt.session()
ses.listen_on(6881, 6891)
h = ses.add_torrent({'ti': lt.torrent_info('mytorrent.torrent'), 'save_path': '.', 'seed_mode': True}) 
print "Total size: " + str(h.status().total_wanted)
print "Name: " + h.name()   
while True:
    s = h.status()
    state_str = ['queued', 'checking', 'downloading metadata', \
      'downloading', 'finished', 'seeding', 'allocating', 'checking fastresume']

    print('\r%.2f%% complete (down: %.1f kb/s up: %.1f kB/s peers: %d) %s' % \
      (s.progress * 100, s.download_rate / 1000, s.upload_rate / 1000, s.num_peers, state_str[s.state]))
    sys.stdout.flush()

    time.sleep(1)

Test in order:

I run the script
mytorrent.torrent is created correctly
print "Total size: " and print "Name:" is OK
Loop print in order:

100.00% complete (down: 0.0 kb/s up: 0.0 kB/s peers: 0) seeding (8 times)

100.00% complete (down: 0.0 kb/s up: 0.0 kB/s peers: 1) seeding (11 times)(This happens always, even if not run the torrent client.)

100.00% complete (down: 0.0 kb/s up: 0.0 kB/s peers: 0) seeding (infinite times)

I run torrent file with torrent client and nothing happens.

enter image description here

In addition to trying download the torrent with a commercial software as above, I have also tried downloading with libtorrent library. Always shows 0 peers.

Variations in the test with the same results:

I tried to use different trackers:

       trackerList = ['udp://tracker.istole.it:80/announce',
           'udp://tracker.ccc.de:80/announce',
           'http://tracker.torrentbay.to:6969/announce',
           'udp://fr33domtracker.h33t.com:3310/announce',
           'udp://tracker.publicbt.com:80/announce',
           'udp://tracker.openbittorrent.com:80/announce',
           'udp://11.rarbg.com/announce'
           'udp://tracker.istole.it:80/announce']

       for tracker in trackerList:        
            t.add_tracker(tracker, 0)

I have run the torrent file in client immediately after executing the script and also later.
lt.torrent_info('mytorrent.torrent') replaced by lt.torrent_info(torrent)

Additional Information:

For testing I am using two Windows computers, each connected to a different network. In each network, the required ports are open.
The time that has been running each test is at least 1:20 hrs.

Other tests:

In the computer I used to share, I tried to share a torrent created by someone else. I have run the code marked with "#Seed torrent" it worked:

100.00% complete (down: 2.0 kb/s up: 45.0 kB/s peers: 13) seeding
In the computer that I use to download the torrent I downloaded a torrent (with libtorrent) already created by someone else, and it worked correctly.

Therefore I can only think that there is a problem in "#create torrent" piece of code. As if the tracker will not save the information set.

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