Debug and improve tests

tests/breakpoints_manual_1n/callback.py

@@ -0,0 +1,4 @@
+#!/usr/bin/env python
+
+def callback(simulator):
+    simulator.log("Hello Callback!")

tests/breakpoints_manual_1n/platform.yaml

@@ -0,0 +1,22 @@
+general:
+  breakpoints: [1,2,3,10]
+  breakpoints_callback:
+        file: "callback.py"
+        callback: "callback"
+
+nodes:
+  count: 2
+  implementations:
+    - all node.py
+
+interfaces:
+  wlan0:
+    type: "wireless"
+    links:
+      - all 2bps 0s all
+    txperfs:
+      - all 2bps 0s
+  eth0:
+    type: "wired"
+    links:
+      - all 2bps 0s all