...
Once the connections has been established, the Client asks the Server to do something or to return some data by mean of a specific application protocol named TCP_DCS.
The Client sends always Command packets and the Server answers with Ok packets, Result packets or Error packets.
Both commands from a Client and answers from the Server always starts with a Header packet.
The Header packet will not be shown in the following description; think of it as always there. But logically, it "precedes the packet" rather than "is included in the packet".
Header packet
| Code Block | ||
|---|---|---|
| ||
Bytes Name ----- ---- 4 packet Length 4 Transaction ID 4 Unit ID |
...