feat: add lab20.conf for socket TCP

Signed-off-by: Jitpanu Maneeratpongsuk <jitpanu.maneeratpongsuk@rwth-aachen.de>

etc/labs/lab20.conf

@@ -0,0 +1,33 @@
+nodes = {
+    tcp_node = {
+        type = "socket",
+
+        layer = "tcp-client",
+
+        format = "villas.human",
+
+        in = {
+            address = "tcpbin.com:4242"
+        },
+        out = {
+            address = "tcpbin.com:4242"
+        }
+    }
+    siggen = {
+        type = "signal"
+        signal = [ "sine", "pulse", "square" ]
+        values = 3, # value per sample
+        rate = 1, # rate of sample
+    }
+}
+paths = (
+    {
+        in = "siggen"
+        out = "tcp_node",
+        hooks = ( { type = "print" } )
+    },
+    {
+        in = "tcp_node", # Receive loopback answer.
+        hooks = ( { type = "print" } )
+    }
+)