LM as a Modbus slave : number of slaves

[SigmaTec]

If you only need read-only values on the modbus side you can simply periodically update the register values in the resident script itself. Modify register mapping in updateregisters() as needed. Each script must use a unique port (502, 503 etc).

Code:

if not mb then   require('luamodbus')   mb = luamodbus.tcp()   mb:open('0.0.0.0', 502)   mb:setslave(2)   function setint64(grpaddr, regaddr)     local value = grp.getvalue(grpaddr) or 0     local raw = knxdatatype.encode(value, dt.int64).dataraw     local r1 = raw:byte(2) * 0x100 + raw:byte(1)     local r2 = raw:byte(4) * 0x100 + raw:byte(3)     local r3 = raw:byte(6) * 0x100 + raw:byte(5)     local r4 = raw:byte(8) * 0x100 + raw:byte(7)     mb:setregisters(regaddr, r4, r3, r2, r1)   end   function updateregisters()     setint64('32/1/1', 3204)   end   mb:setmapping(0, 0, 3300, 0)   updateregisters()   prev = os.time() end mb:handleslave() curr = os.time() if curr ~= prev then   updateregisters()   prev = curr end

Sorry Admin, using your script (without modify it, except '32/1/1') no communication with Modbus master is possible.
Note : I suspended cyclic "Modbus handler" script and preserved "mbproxy" script in common functions.

Perhaps interesting for you 'timeout ?' > founded by monotoring in log : 

res, err = mb:handleslave()
log("mb:handleslave :",res,err)
* arg: 1
  * string: mb:handleslave :
* arg: 2
  * nil
* arg: 3
  * string: timeout