Spikes in data collected from Ruuvitags

Hi,

first, thanks to all for supporting Venus OS.

For the Ruuvitags I got often spikes in the collected data.

Solution:

To reduce the Bluetooth-Speed to 460800 - from 921600 via

/etc/udev/rules.d/machine.rules

- ACTION=="add",SUBSYSTEM=="tty",KERNEL=="ttyS0",RUN+="/usr/bin/hciattach -t 10 /dev/ttyS0 bcm43xx 921600 noflow -"
+ ACTION=="add",SUBSYSTEM=="tty",KERNEL=="ttyS0",RUN+="/usr/bin/hciattach -t 10 /dev/ttyS0 bcm43xx 460800 noflow -"

~# ps -l|grep hciattach
S     0   359     1  1892    84 0:0   16:26 00:00:00 /usr/bin/hciattach -t 10 /dev/ttyS0 bcm43xx 460800 noflow -

Could this file please be changed in VenusOS?

Sources:

https://f.ruuvi.com/t/spikes-in-data-collected-with-rpi3/3669 //#5 August 10, 2019

https://ruuvi.com/setting-up-raspberry-pi-as-a-ruuvi-gateway/

Hardware: Raspberry 3B+

Software: VenusOS-Large-25

2 |3000

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johnny-brusevold commented · Feb 08, 2022 at 08:42 PM

@OlafD

Currently testing out ruuvi tags on pi4v1.4

Can not find anything on the net about reducing the speed for this.

ENV{BASE_COMPATIBLE}!="raspberrypi,4-model-b", GOTO="end-rpi4-model-b"
ACTION=="add",SUBSYSTEM=="tty",KERNEL=="ttyAMA0",RUN+="/usr/bin/hciattach /dev/ttyAMA0 bcm43xx 3000000 flow -"
LABEL="end-rpi4-model-b"

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olafd johnny-brusevold commented · Feb 08, 2022 at 09:08 PM

Hi @johnny-brusevold

For the Ruuvitags I reduced the Bluetooth-Speed to 460800 for all Rasperries.

ACTION=="add",SUBSYSTEM=="tty",KERNEL=="ttyAMA0",RUN+="/usr/bin/hciattach /dev/ttyAMA0 bcm43xx 460800 flow -"
### ACTION=="add",SUBSYSTEM=="tty",KERNEL=="ttyAMA0",RUN+="/usr/bin/hciattach /dev/ttyAMA0 bcm43xx 3000000 flow -"

But haven't tested it with a Pi 4 - I have no.

Hope that helps.

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