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+--- Thread: Modbus TCP debug (/showthread.php?tid=4230)
Modbus TCP debug - MarcusH - 09.09.2022
Hi
Im wondring if its possible for Lm to debug incoming requests from master.
i know about the "mb
etdebug".I managed to get this when using mb:readregister(x) in combination with mb:debug | * string: [00][01][00][00][00][06][FF][03][00][02][00][01] |
This is excatly what i want , but i need to recieve it when an external master sends a request, not the Lm trying to read or write.
I wan't to be able to debug the request so i can use the data later in the code for mapping different settings.
-Marcus
RE: Modbus TCP debug - admin - 12.09.2022
This example will create Modbus TCP slave on port 502. It will log all requests/responses.
Code:
require('luamodbus')
mb = luamodbus.tcp()
mb:open('0.0.0.0', 502)
mb:setmapping(0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF)
debug = {}
mb:setdebug(function(ch)
debug[ #debug + 1 ] = ch
end)
while true do
mb:handleslave()
if #debug > 0 then
log(table.concat(debug))
debug = {}
end
end