remove gui from example (will readd later)

add observer to example

examples/observer/__main__.py

@@ -0,0 +1,43 @@
+import vban_cmd
+
+
+class Observer:
+    def __init__(self, vban):
+        self.vban = vban
+
+    def on_update(self, subject):
+        if subject == "pdirty":
+            print("pdirty!")
+        if subject == "ldirty":
+            info = (
+                f"[{self.vban.bus[0]} {self.vban.bus[0].levels.is_updated}]",
+                f"[{self.vban.bus[1]} {self.vban.bus[1].levels.is_updated}]",
+                f"[{self.vban.bus[2]} {self.vban.bus[2].levels.is_updated}]",
+                f"[{self.vban.bus[3]} {self.vban.bus[3].levels.is_updated}]",
+                f"[{self.vban.bus[4]} {self.vban.bus[4].levels.is_updated}]",
+                f"[{self.vban.bus[5]} {self.vban.bus[5].levels.is_updated}]",
+                f"[{self.vban.bus[6]} {self.vban.bus[6].levels.is_updated}]",
+                f"[{self.vban.bus[7]} {self.vban.bus[7].levels.is_updated}]",
+            )
+            print(" ".join(info))
+
+
+def main():
+    with vban_cmd.api(kind_id, **opts) as vban:
+        obs = Observer(vban)
+        vban.subject.add(obs)
+
+        while cmd := input("Press <Enter> to exit\n"):
+            if not cmd:
+                break
+
+
+if __name__ == "__main__":
+    kind_id = "potato"
+    opts = {
+        "ip": "<ip address>",
+        "streamname": "Command1",
+        "port": 6980,
+    }
+
+    main()