GMT PLC connect to MQTT broker

[borisv]

Hello all,

I am sorry for writing in english but i don't know turkish.

Is it possible to connect 396 or 496 plc to my own mqtt broker ?

i tried changing the ip adress in WMI SCADA web configuration but i cannot connect the plc to my broker. 
I saw a post by user VKU that says he was succesful but i cannot make it work.
i am currently trying with 396 plc but i have a 496 also that i can use.

 

I hope that english is not a problem.

 

Thanks in advance

 

[Hanifi]

Dear Sir,

MQTT is supported by our PLCs, but it is not open  for customer's broker. 

 

[VKU]

I could not make a success connecting 396T PLC via my own broker on my PC.  As Hanifi Bey explained the PLC does not allow customer broker.

But I may suggest another way to read/write Modbus addressed values between 396T PLC and PC. 

VS 2019 Community, NUGET EasyModbusTCP by Stefan Roßmann.

Imports EasyModbus
Public Class Form1
 Public Mb(10) As Boolean  = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
 Public Mw(3) As Integer  ' 04x0001 ...

' Use a radio button to connect PLC via local ethernet IP
' TbxPLC_IP.Text holds PLC IP Addr.
Private Sub RB_F1_ON_Click(sender As Object, e As EventArgs) Handles RB_F1_ON.Click
 TcpClient_1 = New EasyModbus.ModbusClient(Convert.ToString(TbxPLC_IP.Text), 502) ' PLC
 TcpClient_1.Connect()
End Sub

' use a Timer with 200ms interval
Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick
  ' EasyModbus lib supports discrete connection. So, every time to read/write values make a new connection
 TcpClient_1 = New EasyModbus.ModbusClient(Convert.ToString(TbxPLC_IP.Text), 502) ' PLC
 TcpClient_1.Connect()
 If TcpClient_1.Connected Then
 ' for coils
 Mb = TcpClient_1.ReadCoils(0, 7) ' Coil 0 .. 6 -> adres 1..7

' for holding Regs
 Mw = TcpClient_1.ReadHoldingRegisters(0, 2)

 End If
End Sub
End Class

[borisv]

I already have a Home Assistant server running the plc's in my workshop over TCP modbus and it is working very stable for a 6-7 months. I can share some info if you like.
 

But i wanted to connect gmt plc's from outside my shop to my server and when i read that they support MQTT i was very happy for a while, guess im back to square one on that.

I also have a semi working micropython build for  396T that supports networking and IO and i am in the process of porting flash memory, but i am not sure if the staff will allow me to share that here. If i am given the blessing of hanifi i will share most of what i know.