From 5b677ccb4e5291eb1d21f9ef13fd1da221a23956 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Mon, 14 Aug 2023 19:04:35 +0200
Subject: [PATCH] Update simulator.py

---
 waagen/simulator.py | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/waagen/simulator.py b/waagen/simulator.py
index 87b59f0..193d431 100755
--- a/waagen/simulator.py
+++ b/waagen/simulator.py
@@ -1,8 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-# SysTec IT3000A uses CRC16-modbus
-
 import argparse
 import socket
 import datetime
@@ -24,17 +22,20 @@ def handle_systec_it3000a(req: bytes) -> bytes:
     global IDENT_NR
 
     if not req.startswith(b'<') or not req.endswith(b'>'):
-        return b'<01>\r\n'
+        return b'<31>\r\n'
     req = req[1:-1]
 
-    if len(req) > 3:
-        return b'<02>\r\n'
+    if req in (b'OS01', b'OS02', b'OC01', b'OC02'):
+        # set or clear outputs 1 or 2
+        return b'<00>\r\n'
+    elif len(req) > 3:
+        return b'<32>\r\n'
     if req.startswith(b'RN'):
         incr = True
     elif req.startswith(b'RM'):
         incr = False
     else:
-        return b'<02>\r\n'
+        return b'<32>\r\n'
 
     if incr:
         time.sleep(random.randint(0, 40) / 10.0)
@@ -55,6 +56,10 @@ def handle_systec_it3000a(req: bytes) -> bytes:
     return b'<' + data + f'{crc16_modbus(data):8}'.encode('ascii') + b'>\r\n'
 
 
+def log(msg: bytes) -> None:
+    print(msg.decode('ascii'), end='', flush=True)
+
+
 def main() -> None:
     s = socket.socket()
     s.bind(('0.0.0.0', 1234))
@@ -62,14 +67,14 @@ def main() -> None:
     print('Ready for connections')
 
     while True:
-        c, a = s.accept()
-        print(f'Accepting connection from {a}')
+        c, (addr, port) = s.accept()
+        print(f'Accepting connection from [{addr}]:{port}')
         try:
             while True:
                 req = c.recv(1024)
-                print(req.decode('ascii'), end='')
+                log(req)
                 res = handle_systec_it3000a(req)
-                print(res.decode('ascii'), end='')
+                log(res)
                 c.send(res)
         except:
             pass