SimpleSSHD with android in 2018

i used SimpleSSHD for a couple of years to ssh from my desktop to my phone and copy pics and such back and forth it stopped working at some point (maybe last year), presumably due to an android update, and i finally tracked the issue down

find the IP and MAC addresses for the phone, and on the desktop run:

• arp -s 192.168.xx.xx yy:yy:yy:yy

after that, ping and ssh should work again. my understanding is that an android update started blocking arp requests, so when the desktop tries to connect to the phone, it can't convert the ip address to a mac address and gives up