Re: [lwip-users] [Issue] TCP fragmentation over PPP - fragments are lost in LwIP if data is queued for sending

[Marco Jakobs]

That's a known limitation which was discussed at length before. A slow
interface is going to slow down the whole stack. However a large
software fifo on uart tx might mitigate that.

Sylvain

It can be as slow as possible (I'm using an RTOS, so it's not blocking anything) ... but it should never loose data ;-)