Socket respecting size boundaries using TCP

Hello,

I'm working with a device that reads data from USB port. Now my customer wants to use this device with an ethernet/USB converter to allow remote access. We can't change device's firmware, so we have to use protocol designed to serial line communication. In this protocol the data length is embedded into the data.

I'm trying to create a Socket that respects size boundaries using TCP. If I send 3 data messages of 30 bytes, I need to send each one separately. Is it possible?

Thanks in advance,

Jon.