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Add forwarder example with multiple slaves #992

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Merged
janiversen merged 1 commit into from
Jul 30, 2022
Merged

Add forwarder example with multiple slaves #992

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17 changes: 14 additions & 3 deletions examples/modbus_forwarder.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@

def run_forwarder():
"""Run forwarder setup."""
port_server, port_client = get_commandline()
port_server, port_client, slaves = get_commandline()

client = ModbusTcpClient(
host="localhost",
Expand All @@ -32,7 +32,12 @@ def run_forwarder():
# in RemoteSlaveContext
# For e.g to forward the requests to slave with unit address 1 use
# store = RemoteSlaveContext(client, unit=1)
store = RemoteSlaveContext(client)
if slaves:
store = {}
for i in slaves:
store[i.to_bytes(1, "big")] = RemoteSlaveContext(client, unit=i)
else:
store = RemoteSlaveContext(client)
context = ModbusServerContext(slaves=store, single=True)

# start forwarding client and server
Expand Down Expand Up @@ -68,6 +73,12 @@ def get_commandline():
help="the port to use",
type=int,
)
parser.add_argument(
"--slaves",
help="list of slaves to forward",
type=int,
nargs="+",
)
args = parser.parse_args()

# set defaults
Expand All @@ -77,7 +88,7 @@ def get_commandline():
if not args.port_client:
args.port_client = 5010

return args.port, args.port_client
return args.port, args.port_client, args.slaves


if __name__ == "__main__":
Expand Down