How to create a tcp session in linux to send data?

Question

linux

It is necessary to raise a tcp session between the Linux machine and the equipment in order to transfer data to the piece of iron.
Data is a command in decimal form (10 digits).
How can it be implemented?

Answer 1

telnet ip-addr port < youdata.txt
something like that. I may be wrong in the form, some keys may be needed. But do you understand the way?

Answer 2

More or less like this:
echo -n 1234567890 | nc 1.2.3.4 8888

Answer 3

ping ip-addr -p 30313233343536373839 -s 10
will work? only it's not tcp ^^