modem: cmux: Handle C/R bit from address field
The C/R bit in the address field should be handled as explained
in 5.2.1.2 in the spec (3GPP TS 127.010).
To detect if the frame is a command or a response,
we need to know who was the initiator of the CMUX channel.
> Initiator is the station that take the initiative to initialize
> the multiplexer (i.e. sends the SABM command at DLCI 0 )
See the table from given section of the specification.
Also, on UIH frames 5.4.3.1 says
> The frames sent by the initiating station have the C/R bit set to 1
> and those sent by the responding station have the C/R bit set to 0.
NOTE: This is different than a C/R bit in the Type field.
Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>
3 files changed
