[Tutorial] Raspberry Pi NRF24l01 direct connection

[n3ro]

No ideas?

[Sander Teunissen]

the ttyMysensorsGateway can only be accessed as root (user root, group root).
Other serialports seem to have the group "dialout" attached.

I am running node-red which is unable the gateway and I guess this has to do with it. Anyone a solution ?

[Andreas Maurer]

? Are you using the code that is available on github now?

This behavior was Change by Holger a month ago. You can configure the Groups in the makefile:

---

The standard configuration will build the Serial Gateway with a tty name of
'/dev/ttyMySensorsGateway' and PTS group ownership of 'tty' the PTS will be group read
and write. The default install location will be /usr/local/sbin. If you want to change
that edit the variables in the head of the Makefile.

---

[Sander Teunissen]

@Andreas-Maurer Thanks for the quick answer. I used the code from github. I am going to check your suggestions tonight. (right now I am at work ;-)

Sander.

[Roberto Brunialti]

Sorry for my naive question: does it means I ca use a raspi as a nrd24l01 based gateway?

[Sander Teunissen]

@Roberto-Brunialti Yes. Works perfectly ! (apart from the root access ;-)
As stated by blksun813 you need to "sudo make install in the librf24-bcm folder". (add the sudo...)

[andriej]

I'm currently at work, but there's a question: will it run on orangepi? (bananapi-like clone of RPi)
I'll take a look at the code and try to manage... GPIOs are working almost the same (it's compatible).

Maybe if I make a diff-file of things changed, you will be able to merge it and do some 'ifs' so code will be clone-compatible?

Oh well... The library has -bcm in name so I guess it will be rather hard to get it to work...

[Sander Teunissen]

@Andreas-Maurer

to run the gateway:
sudo ./PiGatewaySerial (without sudo I get the error below)

Could not create a symlink '/dev/ttyMySensorsGateway' to PTY! (13) Permission denied

running:
ls -l ttyMySensorsGateway

gives the following:

lrwxrwxrwx 1 root root 10 May  7 17:27 ttyMySensorsGateway -> /dev/pts/2

I checked the makefile and it says

TTY_GROUPNAME := tty

But it doesn't seem to do anything...Any ideas ?

[Andreas Maurer]

The symlink alwayshas 777. Everyone can use it.
Please have a look at /dev/pts/2 This device should have the configured groups.

Ok?

[Sander Teunissen]

@Andreas-Maurer said:

The symlink alwayshas 777. Everyone can use it.
Please have a look at /dev/pts/2 This device should have the configured groups.

Ok?

Yes. Ok!
It works.
Thanks !

[Sweebee]

I tested it on my Rpi B+ its working fine, but the cpu load is always 100%. Is this normal?

[Roberto Brunialti]

An other silly question: can I install a controller into the same raspberry pi (the one with this gateway and nrf )? Are all controllers suitable for such a configuration ?
Thanks!

[Andreas Maurer]

For my Point of view, every Controller which is able to use the Serial Gateway.

[joaoabs]

@Sweebee

Same here. I'm afraid that with the PI at 100% there is no much use of this code becasue we can't do anything else...

Strange that the PI that is much powerfull than an arduino gets so high CPU for something that an arduino nano can do...

Could it be something that could be improved?

Cheers,
Joaoabs

[Andreas Maurer]

I have no problem with it. fhem as controler and mysql as DB is running on the same PI.
The Gateway is not even listed in "top"

[joaoabs]

@Andreas-Maurer

Do you mean you don't have any problems with the fact the CPU is at 100% or you simply don't have the same sympthom?

Thanks for replying,
Joaoabs

[hawk_2050]

Hi,

I think the problem with the PiGatewaySerial showing as consuming 100% is not a real problem. I also see the CPU consuming 100% using the top utility, however as soon as you run another process, for example a user python script, on the Pi, you will notice that top will suddenly report that PiGatewaySerial is using only a few percent of the CPU.

Cheers
Richard

[markusand]

Hi! I want to use RPi as a controller, with direct radio connection and pimatic. I've followed both posts but not sure how to make it work together. I know @Vladut-Grecu is using the same configuration, could you please point me to the right direction?

[Roberto Brunialti]

Ok. It seems the gateway is working as i get the same final screen when I run it. But... does it has a verbose mode? How can I know If it is working? I tried with a test node, unfortunately it seems not working ... or simply it does'nt give any feedback...

[minscof]

I used this gateway on a wheezy debian (RPI2) for several months and everything was ok. I upgraded my raspbian to jessie, and then the CPU load was always 100%. So I try to revert to wheezy, but i have now the same problem : CPU stays at 100 % .

So there must be a system configuration somewhere to improve this gateway and prevent it to use all the CPU.

Do you have an idea ?

Thanks

**Solved **: see this post