Automatically find Arduino without IP -

i have raspberrypi going act server arduinos connected same network.

however, raspberrypi unable automatically connect arduino. have hardcore each arduino ip address server.

is there anyway server search network , identify arduino added server database automatically. or other way round, arduino find server ip , attempts connect it.

my server running on node.js

if both rasbpi , arduino connected same router, in same subnet. can let tell server periodically scan subnet ip range.

i not familiar node.js here starting points network scanning:

• https://www.npmjs.com/package/ip
• https://github.com/jas-/node-libnmap