Re: [PATCH] linux-wpan: Add an IEEE 802.15.4 over LoRa Semtech SX1276/77/78/79 device driver

Hi,

On Mon, Sep 11, 2017 at 11:17 AM, StarNight [off-list ref] wrote:

Hi,

2017-09-11 20:47 GMT+08:00 Alexander Aring [off-list ref]:

quoted

Hi,

On Mon, Sep 11, 2017 at 3:50 AM, Xue Liu [off-list ref] wrote:

quoted

Hello Pan,

From my point of view, it is not a good idea to write sx127x driver
for IEEE 802154. Because LoRa is not compatible with IEEE 802.15.4 in
PHY and MAC layer.

This isn't true. The security layer is exactly the same and copied
from IEEE 802.15.4.
The rest of the mac layer is pretty simple. Simpler than IEEE
802.15.4... for now.

That is the first reason why I write this driver.

I also found "Transmission of IPv6 Packets over LoRaWAN" on IETF website
https://datatracker.ietf.org/doc/draft-vilajosana-lpwan-lora-hc/
However, it has been expired since 2017-01-09.
It is the second reason why I write this driver.

quoted

quoted

I think it is better to make individual Phy and MAC layers for LoRa in
Linux kernel, where a sx127x driver will make sense.

What about to introduce a new interface type? Then you can do a
complete different parsing on this interface type and share the code
what you need from 802.15.4

So, will the suggestion be a new interface like "6LoWPAN over LoRaWAN"?

You mixing L2 and 6LoWPAN here. L2 layer is 802.15.4, there we have
the device nodes "node", "monitor" and "coordinator" (not implemented
yet).
My idea is to add a Lora L2 interface type there and then you can
catch frames and make a "lora.c" file in net/mac802154 for lora frame
handling. If you need 802.15.4 stuff just use it then. This makes
sense, because Lora use some 802.15.4 stuff which is mostly the same.

For 6LoWPAN you need to make an implementation for Lora 6LoWPAN
adaptation, question is if we want to put that in net/ieee802154 :-/
or do e.g. "net/lora" (There you can put lora socket handling/6lowpan
adaptation etc.)

Will wait for Stefan's opinion according to that.

- Alex
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