it mostly works.

proxmark3-web.py

@@ -156,9 +156,23 @@ if(True):
                 flash('ERROR: Could not read a card... please try again....')
                 return redirect(url_for('index'))
 
+    @app.route('/hid/sim')
+    def sim_hid_card():
+        raw_cardnumber = request.args.get('raw_cardnumber')
+        if debug:
+            print('Got card raw: ' + str(raw_cardnumber))
+
+        #Send hid simulate tag to proxmark3
+        write_hid = subprocess.run([proxmark3_rdv4_client, serial_port, '-c', 'lf hid sim ' + raw_cardnumber ], capture_output=True)
+        if('ERROR: serial port' in write_hid.stdout.decode('ASCII')):
+            flash('Serial port error')
+            return render_template('card_list')
+
+
     @app.route('/write')
     def write_hid():
         raw_cardnumber = request.args.get('raw_cardnumber')
+        if debug:
             print('Got card raw: ' + str(raw_cardnumber))
 
         write_hid = subprocess.run([proxmark3_rdv4_client, serial_port, '-c', 'lf t55xx wipe ; lf hid clone ' + raw_cardnumber + ' ; lf hid read' ], capture_output=True)

templates/cards.html

@@ -35,6 +35,10 @@
 			 <input type="hidden" name="raw_cardnumber" value={{ row['card_raw'] }} />
 			 <button type="submit" class="btn btn-primary">Clone</button>
 		 </form>
+		 <form action="/hid/sim" method="get">
+			 <input type="hidden" name="raw_cardnumber" value={{ row['card_raw'] }} />
+			 <button type="submit" class="btn btn-success">Simulate</button>
+		 </form>
 	 </div>
 	 <div class="col">
 		 {{ row['card_facility_code'] }}