Hi.. the same issue with me.. i used this application for a while for productivity of my work..
i used a modem as my router, however since the modem use only SIM for internet, i made a change of internet and now i have new router connected in my computer.. now using the spacedesk app i was not able to make connection to the server even if i add manually the ip address..
before my address is 192.168.1.XXX .
now with the new modem i have 192.168.524.xxx and was not able to make connection between the server and the android app..
appreciate any help to resolve the issue.. ..