Microdds not working with Microhard modem

[voxltester]

I installed a Microhard modem (192.168.168.200) and connected a Wi-Fi dongle to the USB port on the modem. I used MicroDDS through Wi-Fi and the Microhard modem.

One day, I tried to use MicroDDS without the Wi-Fi dongle connected, but systemctl start voxl-microdds-agent did not work. When I reconnected the Wi-Fi dongle to the Microhard modem, MicroDDS worked.
Then I removed the dongle and ran systemctl restart voxl-microdds-agent, and it worked.

However, when I restart the whole system and try to run it again without the Wi-Fi dongle, it does not work.

Do you have any ideas on how to resolve this?