Which library shoul I use to do the things?

Question

What I want to do is:
there will be hardware which will connect the server and send data(about 10 byte - 50 byte each) to the server with 1 - 30 s interval.

the hardware may be 10 - 150 which will work together and may be more years later.

I want to use c++ Is there any library I can use?

just receive the data and keep connection and sometimes send data to the hardware.

what more will be send the data to other services connecting to rpc server.

thank you