Sync TLS needs time before reading frame (#2186)

Author: janiversen

pymodbus/framer/old_framer_tls.py

@@ -1,5 +1,6 @@
 """TLS framer."""
 import struct
+from time import sleep
 
 from pymodbus.exceptions import (
     ModbusIOException,
@@ -42,6 +43,11 @@ def decode_data(self, data):
             return {"fcode": fcode}
         return {}
 
+    def recvPacket(self, size):
+        """Receive packet from the bus."""
+        sleep(0.5)
+        return super().recvPacket(size)
+
     def frameProcessIncomingPacket(self, _single, callback, _slave, _tid=None, **kwargs):
         """Process new packet pattern."""
         # no slave id for Modbus Security Application Protocol