DLMS communication issue when routing through VPN on Android

Hello,

I'm currently testing DLMS communication over Android devices, and I've noticed that some VPNs cause the connection to drop or timeout intermittently when trying to read meter data remotely.

After several trials, I found that using Stag VPN actually resolves the issue. The communication remains stable and meter responses are consistent, even when routed through the VPN. I’m curious—has anyone else here tried DLMS/GXDLMS communication over a VPN? What’s your experience?

Any insights or alternative setups that work reliably would be appreciated.

Thanks!