troubleshooting modbus script to control fornius inverter

[cgn]

Hello,

due to dynamic energy prices I wan't to enable / disable throttle of the inverter. This is possbile via modbus. Unfortunatelly it's not working and I have nothing in the log of LM. 

Code:

require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.111', 502)
mb:connect()
res, err = mb:connect()

if res then

    if (value <35) then
    r0 = mb:writeregisters(40236, 0)
        log(r0, '<')
        
    else
    r1 = mb:writeregisters(40236, 0)
      r2 = mb:writeregisters(40232, 10000)
      r3 = mb:writeregisters(40236, 1) 
      log(r1, r2, r3 '>')
      mb:close()
    end

else
  log('failed', err)
end

Log if value <35
* arg: 1
  * nil
* arg: 2
  * string: <

=> This seems to work

Log if value >35
Nothing in the log and I don't know why. 

Any idea what could be wrong?

[admin]

You have two connect calls, remove one of them. Then log the error returned by the write call:

Code:

r0, err = mb:writeregisters(40236, 0)
log(r0, err)

Same for all other registers.

[cgn]

Thanks, that was an error as well. If someone what's to set the softlimit from a fronius inverter depending on the enery prices, this is the clean code: 

Code:

t = os.date ("*t")
value = grp.getvalue('34/1/' .. t.hour)

require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.111', 502)
res, err = mb:connect()
mb:setslave(1)

if res then
    if (value <35) then
        mb:writeregisters(40236, 0)
        log('PV softlimit')
   
    else
    mb:writeregisters(40236, 0)
      mb:writeregisters(40232, 10000)
      mb:writeregisters(40236, 1) 
      log('PV unlimited')
      
    end
    mb:close()
 
else
  log('failed', err)
end