Kodi on Nvidia Shield TV not seen by Yatse

failed to connect to /192.168.0.108 (port 8080) from /192.168.0.101 (port 35960) after 5000ms

There’s nothing listening at that IP and port triple check your Kodi settings and IP.
If you use DHCP IP have probably changed. You should try SPMC or Kodi 18 that have working zeroconf for autodetection.