Multiple interfaces (net_offload and net_native interface)

[pj-sunny]

Hi,

For my project, I have enabled the net_offload HL7800 driver and it works correctly.

Next I tried to enable the Bluetooth IPSP interface but got stuck.
While bringing up the IPSP interface, it seems that kernel is waiting for the offload interface and finally got timeout.
Can someone shed some light on this?
Thank you.

Also IPv4 is in use for the net_offload HL7800, but IPSP only supports IPv6.
Is it necessary to use IPv6 only for such combination?
Thank you.

[pj-sunny]

Some details are clarified and here are my observations.

it seems that kernel is waiting for the offload interface and finally got timeout.

Still not sure why the kernel is waiting for the offload interface.
But after disabling the offload interface, the kernel is still waiting for the native interface and finally got timeout.
After searching, it turns out that this is kind of expected according to the comment here.

Next I tried to connect to the device right after it boots by my smartphone, but still timeout.
Enabling the debug logging by adding configs below and confirmed that the device is connected.

CONFIG_NET_L2_BT_LOG_LEVEL_DBG=y
CONFIG_BT_L2CAP_LOG_LEVEL_DBG=y

After searching, it is probably because the smartphones do not support the Bluetooth IPSP.
The Q&A here at the nordic devzone is a good reference.

It seems that the Bluetooth IPSP is not the answer for my project.