[lwip-users] PPP shared Internet

[Richard Bailey]

Hi,

 

I am working on an IoT solution. I’ve bumped into an issue around using LWIP.

If I describe the scenario and what I’m trying to achieve, perhaps you can tell me if what I’m trying to do is in theory is possible or if I need to approach it another way.

 

It has a main NXP PCB, with a Microsoft Azure Sphere, secure Wi-Fi module attached.

The Azure Sphere is a bit of a black box, but it handles communication to Microsoft’s Azure Servers over Wi-Fi.

It can also work over Ethernet, but it will not have a physical Ethernet Port on the device.

There will be scenarios where Wi-Fi is not an option, so we need a backup solution.

 

The main NXP PCB has a BG95 modem.

It has an internal circuit-based Ethernet connection between the NXP and the Azure Sphere module.

The plan is for the Azure Sphere module to communicate out over the BG95 modem via the internal Ethernet.

 

The main NXP PCB is running FreeRtos, with LWIP 2.1.3.

I was hoping to simply set up two NetIf adaptors:

• PPPOS for the modem, with the Internet connection
• Ethernet.

Then enable IP_FORWARD.

 

Would that approach work allowing the Azure Sphere to communicate with the outside world, over the internal Ethernet and forwarding to the PPP modem (in both directions)?

 

Thank you for any advice you can give.

 

Richard.

 

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