reading RSSI value
Hello
Is it possible to somehow read RSSI (Received Signal Strength indicator) value for each ieee802154 frame received using raw socket? Quick grepping in kernel and wpan-tools sources says no, but just wanted to confirm. Could energy detection level value used instead? Also, is it possible to set transmitter power from userspace?
Thanks
Anton
Alexander Aring
maintainerHi,
2018-01-21 7:24 GMT-05:00 <[email protected]>:
Quoted 4 lines
Hello
Is it possible to somehow read RSSI (Received Signal Strength indicator) value for each ieee802154 frame received using raw socket? Quick grepping in kernel and wpan-tools sources says no, but just wanted to
One note about raw sockets: you should use AF_PACKET RAW as socket type.
The answer is no. A single RSSI value of a frame says nothing about something... We want to collect them in kernelspace e.g. wireless station dump and make some mapping from $NODE_ADDR (complicated because short/extended mapping).
There exists some thesis branch on github which I did for my "thesis" but not ready to bring upstream at all...
Quoted 1 line
confirm. Could energy detection level value used instead? Also, is it possible to set transmitter power
Also no energy detection and no LQI...
Transmit power is possible (depends on driver support), but not per frame...
- Alex
Alexander Aring
maintainerHi,
2018-01-21 12:59 GMT-05:00 Alexander Aring <[email protected]>:
Quoted 17 lines
Hi,
2018-01-21 7:24 GMT-05:00 <[email protected]>:
Quoted 4 lines
Hello
Is it possible to somehow read RSSI (Received Signal Strength indicator) value for each ieee802154 frame received using raw socket? Quick grepping in kernel and wpan-tools sources says no, but just wanted to
One note about raw sockets: you should use
AF_PACKETRAW as socket type.The answer is no. A single RSSI value of a frame says nothing about something... We want to collect them in kernelspace e.g. wireless station dump and make some mapping from $NODE_ADDR (complicated because short/extended mapping).
There exists some thesis branch on github which I did for my "thesis" but not ready to bring upstream at all...
Quoted 6 lines
Quoted 1 line
confirm. Could energy detection level value used instead? Also, is it possible to set transmitter power
Also no energy detection and no LQI...
Transmit power is possible (depends on driver support), but not per frame...
got a new idea about to handle this per frame. Talked with one of the TC maintainers today... I think it would be nice to have a TC action where you can set a transmit power per classifier... not sure there exists many way how to handle it. Also there was an idea according to 6lowpan to handle it per ndisc entry. :-/
If you really want to set it per frame. 802.11 people might be interessted in the "wireless tx power TC action" as well...
- Alex
Quoted 33 lines · Alexander Aring
Hi,
2018-01-21 12:59 GMT-05:00 Alexander Aring <[email protected]>:
Quoted 17 lines
Hi,
2018-01-21 7:24 GMT-05:00 <[email protected]>:
Quoted 4 lines
Hello
Is it possible to somehow read RSSI (Received Signal Strength indicator) value for each ieee802154 frame received using raw socket? Quick grepping in kernel and wpan-tools sources says no, but just wanted to
One note about raw sockets: you should use
AF_PACKETRAW as socket type.The answer is no. A single RSSI value of a frame says nothing about something... We want to collect them in kernelspace e.g. wireless station dump and make some mapping from $NODE_ADDR (complicated because short/extended mapping).
There exists some thesis branch on github which I did for my "thesis" but not ready to bring upstream at all...Quoted 6 lines
Quoted 1 line
confirm. Could energy detection level value used instead? Also, is it possible to set transmitter power
Also no energy detection and no LQI...
Transmit power is possible (depends on driver support), but not per frame...
got a new idea about to handle this per frame. Talked with one of the TC maintainers today... I think it would be nice to have a TC action where you can set a transmit power per classifier... not sure there exists many way how to handle it. Also there was an idea according to 6lowpan to handle it per ndisc entry. :-/
Quoted 4 lines
If you really want to set it per frame. 802.11 people might be interessted in the "wireless tx power TC action" as well...
- Alex
But changing transmit power is possible in runtime, isn't it? I mean, without bringing interface down/up. Or not?
Is it supported by at86rf230 driver for at86rf212 chip? It seems that yes
Anton
Alexander Aring
maintainerHi,
2018-01-24 12:24 GMT-05:00 <[email protected]>:
Quoted 37 lines · Alexander Aring
Quoted 36 lines
Hi,
2018-01-21 12:59 GMT-05:00 Alexander Aring <[email protected]>:
Quoted 17 lines
Hi,
2018-01-21 7:24 GMT-05:00 <[email protected]>:
Quoted 4 lines
Hello
Is it possible to somehow read RSSI (Received Signal Strength indicator) value for each ieee802154 frame received using raw socket? Quick grepping in kernel and wpan-tools sources says no, but just wanted to
One note about raw sockets: you should use
AF_PACKETRAW as socket type.The answer is no. A single RSSI value of a frame says nothing about something... We want to collect them in kernelspace e.g. wireless station dump and make some mapping from $NODE_ADDR (complicated because short/extended mapping).
There exists some thesis branch on github which I did for my "thesis" but not ready to bring upstream at all...Quoted 6 lines
Quoted 1 line
confirm. Could energy detection level value used instead? Also, is it possible to set transmitter power
Also no energy detection and no LQI...
Transmit power is possible (depends on driver support), but not per frame...
got a new idea about to handle this per frame. Talked with one of the TC maintainers today... I think it would be nice to have a TC action where you can set a transmit power per classifier... not sure there exists many way how to handle it. Also there was an idea according to 6lowpan to handle it per ndisc entry. :-/
If you really want to set it per frame. 802.11 people might be interessted in the "wireless tx power TC action" as well...
Quoted 7 lines
Quoted 1 line
- Alex
But changing transmit power is possible in runtime, isn't it? I mean, without bringing interface down/up. Or not?
Is it supported by at86rf230 driver for at86rf212 chip? It seems that yes
no, but this has only one reason currently why we allow this only on ifdown... we need to set the txpower for next transmit. We don't do a transmit power setting WHILE the transceiver is actually sending, this ends mostly in some UNDEF behavior of transceivers (the vendors doesn't say anything about that handling in datasheets and it sounds fragile).
BUT this will not be solution to make in userspace something like:
set_power(x);send_frame(....);set_power(y);send_frame(....);
Such use case can be done by some another ideas with sendmsg() CMSG OR what I said before by a TC action.
- Alex