After months of using a collection of hacked-together scripts I’ve made a kodi add-on that synchronises the kodi library watched status between devices
At home we use a couple of OSMC devices, plus occasionally the computer, to play back TV recordings and with the add-on it allows us to stop play back in one room and within seconds it appears on the kodi home screen ready to continue watching in another room.
It doesn’t require mysql setup. It doesn’t require all the devices to be powered on 24/7 either. It works with devices that use the standard sqlite database (support to refresh the home screen for mysql databases is coming if there is interest)
To install the add-on please follow the installation instructions on Github
Hope you find it useful