fix crash on bytes

app.py

@@ -12,6 +12,16 @@ MY_NODE_ID =  "!934f4430"
 iface = meshtastic.serial_interface.SerialInterface()
 # iface.nodes.clear()
 
+def safe_dict(obj):
+    if isinstance(obj, dict):
+        return {k: safe_dict(v) for k, v in obj.items()}
+    elif isinstance(obj, list):
+        return [safe_dict(i) for i in obj]
+    elif isinstance(obj, bytes):
+        return obj.decode(errors="replace")
+    else:
+        return obj
+
 @app.route("/")
 def index():
     return render_template("map.html")
@@ -29,7 +39,7 @@ def nodes():
     return jsonify({
         # "myNodeNum": MY_NODE_NUM,
         "myNodeId": MY_NODE_ID,
-        "nodes": dict(nodes)
+        "nodes": safe_dict(nodes)
     })
 
 if __name__ == "__main__":