Beagle expertise needed

[Richard Maurer]

Hello Beaglebone community:

I've been working with the Beaglebone for a while now, and though I have some ability and knowledge, I'm not a software guy - just a lowly aero engineer, and my skill is limited.  I've got a small project I need to be accomplished, I've got limited time to commit to it, and I'm willing to offer financial compensation for a solution.  This is what I need to do:

I need to have two Beaglebones communicate with each other wireless-ly. My plan was to use a green wireless beagle and another beagle with a wifi dongle, and connect the two via a node-red flow.  It should come as no surprise that this hasn't gone smoothly for me.  I couldn't get my green wifi beagle on-line to load the beagle gpio node-red flows. I imagine its possible to use existing (node-red) tcp/networking tools to eliminate the need for the gpio flows, but my networking skills are limited.

I'm not committed to a particular solution, other than I'd prefer to use beagles (vs. arduino, r pi, etc,) as I'm more familiar with this platform.  I just need someone to develop a software pack that they can deploy to me.  Alternatively, if it requires finicky loading of 3rd party software, I'm prepare to purchase the hardware from you as well.  And then I'll need a little explanation of how it's put together so that I can properly manage the system.

So if there's any talented individuals out there interested in this, please let me know.  The first person who has sufficient skills that they can get the job done, and at a reasonable cost to me, gets the job.  

Thanks,

Rich

[Richard Maurer]

Here is some additional info that was requested:

Message size is small (< 20 bits probably no more than 5 -- just enough to turn stuff on and off), but with at least 5 updates per second.  At this point, I'm only envisioning streaming data.  Reliability is not critical (i,e., system can tolerate message loss), however system cannot tolerate inaccurate messages, as we don't want to turn off/on something incorrectly, but if there is a short delay, that is acceptable.  The solution has to be manageable by me which means that the software can't be wrapped up in highly complex networking algorithms that would be inaccessible by an 'engineer'.  I need to at least manage changes in data (not necessarily data type, but at least what data is sent), and I need to be able to access the data in each beagle with either Python, C#, or some other simple language.

[William Hermans]

I'd like to point out, that if you want / need reliability. Wireless is probably not the vehicle to get you there.

On Wed, Jan 11, 2017 at 10:12 AM, Richard Maurer <maur...@gmail.com> wrote:

Here is some additional info that was requested:

Message size is small (< 20 bits probably no more than 5 -- just enough to turn stuff on and off), but with at least 5 updates per second.  At this point, I'm only envisioning streaming data.  Reliability is not critical (i,e., system can tolerate message loss), however system cannot tolerate inaccurate messages, as we don't want to turn off/on something incorrectly, but if there is a short delay, that is acceptable.  The solution has to be manageable by me which means that the software can't be wrapped up in highly complex networking algorithms that would be inaccessible by an 'engineer'.  I need to at least manage changes in data (not necessarily data type, but at least what data is sent), and I need to be able to access the data in each beagle with either Python, C#, or some other simple language.

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[Richard Maurer]

If I could use a wired connection, I'd simply wire the GPIOs  together, and then I'd be all set. But I need a wireless solution.

[Heinz Hummel]

Without having tried anything in this direction:

Why not use two BBGW, set up one as access point using hostapd and use the other as normal wireless client that accesses this AP?

[TJF]

Hi Richard!

Why do you plan to use the BBGW? Isn't this an overkill for just reading or writing some GPIO? You'll have to deal will long boot time and all the LINUX overhead.

I mean, why don't you plan to use an ESP 8266 module instead, ie. ESP12E. It's cheap, comes with WiFi and can handle at least 12 GPIOs, booting fast and can get programmed in Python (but LUA has better support).

Regards

[Richard Maurer]

True, it is overkill, but the reduced performance is not a problem for me. And BBGs are getting pretty inexpensive. I've got a fair amount of experience with the BB and like that I can open up a shell and see what's going on with it, which is better for my simple engineer's mind. Wifi systems tend to require some tending to, so it's best I understand the system as well as possible.  And I would prefer not to have to learn about a different platform.  I'm not proficient with I2C or even serial comm, whereas BB has a lot of off-the-shelf software that I can easily access.  But even at that, I'm currently stuck in Node red trying to tcp from 1 board to the next, but I can't get the connection made.  I just bricked one of my BBs playing with the interfaces file and now I've got to reflash it.  So... gotta go with what is easiest for me to understand.

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[Richard Maurer]

Heinz, there are definitely methods that are sure to work.  Your suggestion is probably one of them.  But I'm not familiar with hostapd, and it doesn't look like it's as 'canned' a solution as i.e., node-red, which is how I'm trying to do it now.  So this isn't so much a 'can it be done' question as much as 'Exactly how can it be done?'  Thanks for the suggestion.

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[roberts...@yahoo.com]

--------------------------------------------
On Thu, 1/12/17, Richard Maurer <maur...@gmail.com> wrote:

Subject: Re: [beagleboard] Re: Beagle expertise needed
To: beagl...@googlegroups.com
Date: Thursday, January 12, 2017, 7:59 PM

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neasca a devenit subiect de discutie intre Marile Puteri Sub presiunea lor rorTI rta a f0St obligata sa numeasca primii domni pamanteni lonita Sandu Sturza - Moldova si Grigore Dimitrie Ghica in tara Romaneasca . Sosirea lor in p pate fn toamna anului 1822 concidea cu retragerea trupelor otomane de

[TJF]

Am Donnerstag, 12. Januar 2017 18:56:26 UTC+1 schrieb Richard Maurer:

So... gotta go with what is easiest for me to understand.

That's why I introduced the ESP solution.

It's plug-and-play when you spend a few further bugs and buy a developers board like nodeMCU. You plug in the USB, start a terminal and you'll also see what's going on with it in the Lua interpreter.

For my engineers mind, this solution will provide faster results. You can focus on the necessary features and use a lot of-the-shelf features.

Anyway, it's your decision. Good luck for your project.

[Richard Maurer]

FYI, I ended up implementing the solution exactly as I had hoped -- One Beagle Green wireless as client, another Beagle hooked via ethernet to an AP as server, and using Nodered to TCP between the two.  It's working nearly exactly as I want except that I seem to be unable to establish a service on the BBG wireless (needed to execute a .py program to run an IMU.  It's giving me a 

The unit files have no installation config (WantedBy, RequiredBy, Also, Alias....

error when I try to enable the service.  Not sure why, as I was able to enable the Nodered service, using their code and installation guide.  I've seen a number of recent similar errors that have been reported in bug reports, so I might be doing the installation correctly, but just can't figure out what is different in the node-red service.  

Anyway thanks for the inputs, offers, and suggestions.  

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[William Hermans]

If you're trying to enable, thus "install" a service with systemctl You need a Wantedby target.

But just google: "how to systemd" + <whichever search term you need> and you'll probably be greated by way more hits than you'll ever need.

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[Richard Maurer]

Yup, been all over searches for systemd, and tried different options.  Here is my current script /lib/systemd/system/imuout.service:

[Unit]

Description=imu output

#Wants=network.target

#After=syslog.target network.target

[Service]

#Type=simple

#User=root

#Group=root

#Nice=5

ExecStart=/usr/bin/imuout.sh

WorkingDirectory=/home/tinkerforge/Example_project/

StandardOutput=null

[install]

WantedBy=multi-user.target

Alias=imuout.service

with the same error with various options above attempted and commented out

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[William Hermans]

You need something like this:

[Unit]
Description=imu output
After=network.target

[Service]
ExecStart=/usr/bin/imuout.sh
Type=oneshot

[install]
WantedBy=network.target

All the rest of that "garbage" is exactly that - Garbage. Your script can deal with working directory, and not outputting to terminal if that's what you wish. Then you simply . . .

systemctl daemon-reload
systemctl enable <service name> --now

Making sure that service-name.service exists in /lib/systemd/system/

As far as what target you need, well that I don't know. I have no clue what an IMU *is* in the context of Nodered, and no idea what you're trying to do. However, if you need your service to run, and all it requires is a network to be established. The above should work.

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[roberts...@yahoo.com]

--------------------------------------------

On Sat, 1/21/17, William Hermans <yyr...@gmail.com> wrote:

Subject: Re: [beagleboard] Re: Beagle expertise needed
To: beagl...@googlegroups.com

Date: Saturday, January 21, 2017, 10:57 PM

RequiredBy, Also, Alias....error when I try to

gid/beagleboard/CAMYVp3kFTEVCp
uxaX1QsftdgJY7VZ2ScVJ%2BpnZxSc
a4Zzo8-gA%40mail.gmail.com.

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1proprietate funciara nu s-a specializat in exportul de cereale. Cele 12 zile de claca statuate inca din vremea lui Constantin Mavrocordat au fost mai mereu inlocuite cu un volum de munca reciproc convenabil prin buna invoiala de multe ori convertit in bani in Moldova de la 1 leu la 2 lei in tara Romaneasca cresterea a urcat pana la 1 leu spre 1818 .

[Richard Maurer]

robertsmaria934 , there appears to be no text in your message.

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 1proprietate funciara nu s-a specializat in exportul de cereale. Cele 12 zile de claca  statuate inca din vremea lui Constantin Mavrocordat  au fost mai mereu inlocuite cu un volum de munca reciproc convenabil  prin buna invoiala  de multe ori convertit in bani  in Moldova de la 1 leu la 2 lei  in tara Romaneasca cresterea a urcat pana la 1 leu  spre 1818 .

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[Richard Maurer]

William Hermans, I can assure you that I started with a simple unit file nearly exactly as you had offered. Knowing little about Linux, I somewhat blindly added guesses on additional commands, but with no improvement.  And just to be sure, I followed your instructions to the tee.  I used, 

ln /lib/systemd/imuout.service imuout.service

to create the link.  But I had the same result/error message when I attempt to enable the service.  

[William Hermans]

On Sat, Jan 21, 2017 at 4:29 PM, Richard Maurer <maur...@gmail.com> wrote:
>
> William Hermans, I can assure you that I started with a simple unit file nearly exactly as you had offered. Knowing little about Linux, I somewhat blindly added guesses on additional commands, but with no improvement.  And just to be sure, I followed your instructions to the tee.  I used,
> ln /lib/systemd/imuout.service imuout.service
> to create the link.  But I had the same result/error message when I attempt to enable the service. 

Except you didn't follow my instructions to the tee.

I gave no such instructions to do this:

ln /lib/systemd/imuout.service imuout.service

The file must physically be located in /lib/systemd/system/. Not a link to another file, not in a different directory. /lib/systemd/system/imuout.service

[Richard Maurer]

okay, fair enough, although everything on line states to create a symlink.  Anyway, I found the error -- if you look at my cut/paste, you'll notice {install] -- should be [Install].

I was manually copying from my ipad.  Knew it was a bad idea at the time.

Thanks

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[William Hermans]

On Sat, Jan 21, 2017 at 5:03 PM, Richard Maurer <maur...@gmail.com> wrote:
>
> okay, fair enough, although everything on line states to create a symlink.  Anyway, I found the error -- if you look at my cut/paste, you'll notice {install] -- should be [Install].
> I was manually copying from my ipad.  Knew it was a bad idea at the time.
> Thanks

So keep in mind when I say it bugs the s**t out of me when someone says they followed my instructions when they fail to duplicate my results. Because I test everything, and put that test, and instructions in a text file. As it happens, I had just done this yesterday, for a client's system . . .

[William Hermans]

Additionally. "Everything" online hasn't worked out for you yet, Has it ? I've tested what I've done. It works with:

root@beaglebone:~# uname -r
4.4.38-bone-rt-r14
root@beaglebone:~# cat /etc/dogtag
BeagleBoard.org Debian Image 2016-06-19
root@beaglebone:~# systemctl status log-halt.service
● log-halt.service - Halt logger
   Loaded: loaded (/lib/systemd/system/log-halt.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
root@beaglebone:~# systemctl status log-reboot.service
● log-reboot.service - Reboot logger
   Loaded: loaded (/lib/systemd/system/log-reboot.service; enabled; vendor preset: enabled)
   Active: inactive (dead)

Which "logging" system going down is actually a small part of the services. So again, I know what I said will work for you, because it works for me. It has to work, otherwise I don't get paid. The only thing I don't know for your case, is what target you need to hook off of. It could be network.target, network-online.target, or any other number of network related target I'm unaware of. It could even be more than one target simultaneously.



So in the future, do me a favor. I took time out of my life to try and help you fix your problem. Do me the service of at least doing exactly as I mentioned, before you try to discredit what I'm saying works. Maybe, that was intentional, maybe not. I honestly don't care. Because I do not get paid trying to help you with your problem.

Also, there may even be many ways, or slightly similar ways to do the same thing. Maybe creating a symbolic file link will work ? But if I'm instructing someone to do something the way I know how, and they're off in left field somewhere, complaining that what I'm trying to instruct doesn't work . . . well at some point, I'm just going to stop caring if they find a solution or not.

[Richard Maurer]

Hey, language.  There are kids on the internet.  BTW, your .service file had the same bug with a small 'i' in Install, so it would not have worked anyway.  But as you said in your later post, you're not getting paid, so I'm not here to quibble.

Anyway, I enabled the service, but it won't start due to some internal error:

root@beaglebone:/tinkerforge/Example_project# systemctl start imusend.service

Job for imusend.service failed because the control process exited with error code.

See "systemctl status imusend.service" and "journalctl -xe" for details.

root@beaglebone:/tinkerforge/Example_project# systemctl status imusend.service

â imusend.service - imu output

   Loaded: loaded (/lib/systemd/system/imusend.service; enabled; vendor preset: enabled)

   Active: failed (Result: exit-code) since Sun 2017-01-22 00:25:54 UTC; 16s ago

  Process: 7219 ExecStart=/usr/bin/imuout.sh (code=exited, status=1/FAILURE)

 Main PID: 7219 (code=exited, status=1/FAILURE)

Jan 22 00:25:54 beaglebone imuout.sh[7219]: <type 'exceptions.TypeError'>: 'NoneType' object is not callable

Jan 22 00:25:54 beaglebone imuout.sh[7219]: Traceback (most recent call last):

Jan 22 00:25:54 beaglebone imuout.sh[7219]:   File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner

Jan 22 00:25:54 beaglebone imuout.sh[7219]:   File "/usr/lib/python2.7/threading.py", line 763, in run

Jan 22 00:25:54 beaglebone imuout.sh[7219]:   File "/usr/local/lib/python2.7/dist-packages/tinkerforge/ip_connection.py", line 687, in receive_loop

Jan 22 00:25:54 beaglebone imuout.sh[7219]: <type 'exceptions.TypeError'>: 'NoneType' object is not callable

Jan 22 00:25:54 beaglebone systemd[1]: imusend.service: Main process exited, code=exited, status=1/FAILURE

Jan 22 00:25:54 beaglebone systemd[1]: Failed to start imu output.

Jan 22 00:25:54 beaglebone systemd[1]: imusend.service: Unit entered failed state.

Jan 22 00:25:54 beaglebone systemd[1]: imusend.service: Failed with result 'exit-code'.

root@beaglebone:/tinkerforge/Example_project#

The shell file runs fine when I call it from the terminal: /usr/bin/imuout.sh

But the system won't run it as a service for some reason.

/usr/local/lib/python2.7/dist-packages/tinkerforge/ip_connection.py", line 687 simply reads:

        while self.receive_flag:

            try:

                data = self.socket.recv(8192)

            except socket.error:

                if self.receive_flag:

                    e = sys.exc_info()[1]

                    if e.errno == errno.EINTR:

                        continue

                    self.handle_disconnect_by_peer(IPConnection.DISCONNECT_REASON_ERROR, socket_id, False)

                break

687         if len(data) == 0:

                if self.receive_flag:

                    self.handle_disconnect_by_peer(IPConnection.DISCONNECT_REASON_SHUTDOWN, socket_id, False)

                break

            pending_data += data

This may be a bug in Python 2.7: http://bugs.python.org/issue14623

Per one recommendation:

The most simple workaround is to add timeout

time.sleep(1)

in the end of script that allows the threads to finish before the script comes to end of life and close

Haven't figured out where to put a time.sleep(1) line.  

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[William Hermans]

On Sat, Jan 21, 2017 at 6:16 PM, Richard Maurer <maur...@gmail.com> wrote:
>
>   BTW, your .service file had the same bug with a small 'i' in Install, so it would not have worked anyway.

That was not my script, that was your service edited, with all the unnecessary stuff removed. Copy-pasted.

[Richard Maurer]

Obviously

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[dd]

Hi Richard.  sorry for the late reply.  Did you solve this problem?  Use a zigbee cape.  

Your data rates are quite low, so this should be no problem and their range and 

robustness is much better than wifi.  

later....dd

On Sunday, January 22, 2017 at 3:40:14 AM UTC+2, Richard Maurer wrote:

Obviously

On Sat, Jan 21, 2017 at 8:37 PM, William Hermans <yyr...@gmail.com> wrote:

On Sat, Jan 21, 2017 at 6:16 PM, Richard Maurer <maur...@gmail.com> wrote:
>
>   BTW, your .service file had the same bug with a small 'i' in Install, so it would not have worked anyway.

That was not my script, that was your service edited, with all the unnecessary stuff removed. Copy-pasted.

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[Richard Maurer]

Thanks -- worked it out as planned

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