Am 05.08.2018 um 02:11 schrieb Andreas Färber:

Am 03.07.2018 um 17:11 schrieb Jian-Hong Pan:

quoted

2018-07-01 19:07 GMT+08:00 Andreas Färber [off-list ref]:

quoted

5) Many of the modules support multiple modes, such as LoRa, LoRaWAN and FSK.
   Lacking a LoRaWAN implementation, I am currently switching them into LoRa
   mode at probe time wherever possible. How do we deal with that properly?

[...]

Independently of what LoRaWAN does, the
user needs to be able to send on the physical layer from a selection of
LoRa, GFSK, FSK, OOK, GMSK and MSK.
Supposedly Wireless M-Bus and IEEE 802.15.4 can be implemented via those
according to the SX1276 datasheet.

This opens a can of worms...

SX127x has a single channel, so I don't think there should be six
network interfaces lora0, gfsk0, fsk0, ook0, gmsk0 and msk0 exposed to
the user.
Having a lora0 interface speak non-LoRa modulations may be confusing,
but since the chip is sold as LoRa transceiver it might be acceptable.

SX130x has 8+2 channels, with IF9 dedicated to GFSK/FSK. It appears to
use one FIFO for receiving (up to 16 packets) and can only transmit one
packet at a time. So I think this should be one lora0 interface, too.

With a view to supporting non-LoRa RF chipsets such as Si4xxx (GFSK,
FSK, OOK) or nRF905 and nRF24L01+ (both GFSK) at a later date, I don't
think those modulations should be some netlink option on a PF_LORA
interface but cleanly distinguished as ETH_P_GFSK or something.
For example, the Chistera Pi HAT has both an RFM95W and an RFM22 module.

Answering myself here: MSK is a special case of FSK, and GMSK a special
case of GFSK. SX1276 allows to switch between LoRa and FSK/OOK modes,
and in FSK/OOK mode between FSK and OOK modulation types and for FSK
modulation allows to set Gaussian filter values. I assume (G)MSK is
selected indirectly through BitRate and Fdev settings or something.

So we would just need ETH_P_FSK and ETH_P_OOK plus some skb fields for
ETH_P_FSK.

Regards,
Andreas

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