step-1 : connect your laptop with you mobile hotspot.
step-2 : get your Ipv4 through command line by typing ipconfig.
step-3 : now youcan access your localhost through your mobile just go to your browser and search ( Ipv4:port/your route ) by this you able to access sender and reciver file.
for sender file route is default '/' but for reciever file route is '/receiver'