doc: improved instructions in p4 test

src/tests/p4-fwd-l1/README.md

@@ -2,6 +2,12 @@
 
 This directory contains the necessary scripts and configurations to run tests for the P4 functionality of TFS.
 
+## Prerequisites
+
+This test requires some custom monitoring services (latency monitoring and probe).
+These services are implemented in Rust and can be found in the `./probe` directory.
+To build these services on your target platform, follow the instructions in `./probe/probe-tfs/README.md`.
+
 ## Basic scripts
 
 To run the experiments you should use the five scripts in the following order:

src/tests/p4-fwd-l1/probe/probe-tfs/README.md

-# rust-tfs
+# Rust-tfs
+
 Client for TFS functionalities written in Rust.
+
+## Dependencies
+
+This project requires the cargo Rust compiler:
+
+```sh
+sudo apt-get install protobuf-compiler cargo
+```
+
+## Build
+
+Build sources as follows:
+
+```sh
+cargo build
+```
+
+After a successfuly build, two new executables will be generated in `target/`.