From 91b1b0afccfb28f6a65fa58352408df3308bbfe2 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Mon, 3 Aug 2026 10:41:01 +0200
Subject: [PATCH] scales: Add Gassner-Enq

---
 scales/simulator.py | 52 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 48 insertions(+), 4 deletions(-)

diff --git a/scales/simulator.py b/scales/simulator.py
index ab7166a..fa7e5f0 100755
--- a/scales/simulator.py
+++ b/scales/simulator.py
@@ -56,7 +56,41 @@ def handle_systec_it(req: bytes) -> bytes:
     return b'<' + data + f'{crc16_modbus(data):8}'.encode('ascii') + b'>\r\n'
 
 
-def handle_avery_async(client: socket.socket) -> None:
+def handle_gassner_enq(req: bytes) -> bytes:
+    global IDENT_NR
+
+    if req.startswith(b'C'):
+        # set date and time
+        incr = False
+    elif req == b'\x05':
+        incr = True
+    elif req == b'?':
+        incr = False
+    else:
+        return b'\x02ES      0      0      0 1                  \x03'
+
+    if incr:
+        time.sleep(random.randint(0, 5) / 10.0)
+
+    gew = random.randint(40, 4000)
+    m = random.randint(1, 10)
+    if incr:
+        match m:
+            case 1:
+                return b'\x02 M      0      0      0 1                  \x03'
+            case 2:
+                incr = False
+                gew = 0
+
+    if incr:
+        IDENT_NR += 1
+    now = datetime.datetime.now()
+    data = f'{IDENT_NR:6}{now:%Y%m%d%H%M%S}' if incr else '                    '
+    data = f' S{gew:7}{0:7}{gew:7}{1:2}{data}'
+    return b'\x02' + data.encode('ascii') + b'\x03'
+
+
+def handle_avery_event(client: socket.socket) -> None:
     global IDENT_NR
     try:
         client.settimeout(0)
@@ -94,12 +128,22 @@ def main(mode: str) -> None:
                     c.send(res)
             except:
                 pass
-        elif mode == 'Avery-Async':
-            handle_avery_async(c)
+        elif mode == 'Gassner-Enq':
+            try:
+                while True:
+                    req = c.recv(1024)
+                    log(req + b'\n')
+                    res = handle_gassner_enq(req)
+                    log(res + b'\n')
+                    c.send(res)
+            except:
+                pass
+        elif mode == 'Avery-Event':
+            handle_avery_event(c)
 
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
-    parser.add_argument('mode', choices=['SysTec-IT', 'Avery-Async'])
+    parser.add_argument('mode', choices=['SysTec-IT', 'Gassner-Enq', 'Avery-Event'])
     args = parser.parse_args()
     main(args.mode)