EVCS migration to MQTT for communication with GX device, EVCS does not show in GX device list

Q&A and troubleshooting EVCS
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1

I have attempted to migrate a Victron EVCS (that has been in good operation for two years) from using communication via Modbus TCP to using the new MQTT based method but the EVCS does not show up as a device in the GX device.

However from the EVCS side it can communicate with the GX device and get all the data it needs such as SoC, AC inverter load, solar power coming in etc and will run in automode. So it appears the issue may be on the GX device side.

System details

  • VenusOS version 3.81 running on a CCGX
  • Victron EVCS v1 with no screen running version 2.09

Steps to migrate that I tried

  • go to GX device with Remote Console
    • Settings → Integrations → Modbus TCP Server
      • Disable this as we are moving to using MQTT instead
    • Settings → Integrations → MQTT Devices
      • tap “Activate”
  • go to EVCS web UI
    • Settings → General → GX Device
      • Communication type
        • change from Modbus TCP to MQTT
        • tap “Discover”
        • choose GX device
        • tap “Pair”
        • tap “Save”
  • the EVCS then shows up on GX UI as expected as a paired device in Settings → Integrations → MQTT Devices
  • the result is that the GX device does not show the EVCS in the devices list as it should
    • in the devices list the EVCS shows an entry but it is not connected, it is like this is a cached version of the Modbus TCP EVCS entry in the device list, like that MQTT based on is unable to show up because the Modbus TCP based one is there blocking it?
  • things I tried
    • reboot GX device
    • reboot EVCS
    • remove the disconnected EVCS entry in the devices list via the popup option that shows up
    • remove MQTT pairing
    • start again
  • none of these things worked, the device list always did not show the EVCS
2

Try following:

Go to GX device with Remote Console

Settings → Integrations → Modbus TCP Server

ENABLE Modbus TCP Server (there is no conflict if you’re using MQTT instead).

I’m presuming that GX device and EVCS IP’s are in the same network or vlan.

Then:

Settings → Integrations → Modbus Devices →Saved Devices (if there is no saved device add manually your EVCS IP address).

Hopes will work…