Raspberry Pi Forums

SurferTim

I've used mplayer and UDP to sync video with good results. Don't know how you are using NTP to sync your video though. If you are planning on using NTP, it seems UDP might be better. Just my opinion... I'm actually not sure how that would work (I have no experience streaming video), but my goal her...

SurferTim

I've used mplayer and UDP to sync video with good results. Don't know how you are using NTP to sync your video though. If you are planning on using NTP, it seems UDP might be better.

Just my opinion...

SurferTim

I have the Adafruit model, but if you don't need 10Hz updates, you would be as well served by the ublox.

The Ultimate GPS unit is easily programmable to select only certain outputs and baud rate. I don't know about the ublox.

SurferTim

If a dhcp client requests network settings, the dhcp server will issue an ip from its dhcp range. I highly recommend not using a static IP that is within the dhcp server range for this reason. My routers check the localnet for an active device with that ip by pinging it. If a device responds to the ...

SurferTim

Ok, i see... this was my idea but than the raspberry pi must send a request to the online server every minute or so. Is this the way to go? It is not completely realtime and it makes a lot of unnecessary sql connections. Yes. Unfortunate but true. The client RPis behind a router must initialize the...

SurferTim

It must be a server on the internet. If your rpi is accessible from the internet, you are ok. You must use the server as a "relay". Your clients send a command that is stored in the SQL database. The client's rpi connects to the server and retrieves the commands.

SurferTim

If the server has a SQL database you might be able to implement that.

How savvy are you with a SQL database?

SurferTim

If you are using Stretch, open /etc/dhcpcd.conf with a text editor. There are plenty of commented out examples there.

SurferTim

If you are using the Stretch version of Raspbian, remove all that. There should be only one uncommented line in /etc/network/interfaces unless you are setting up a bridge, which you aren't.

SurferTim

Post the contents of your /etc/network/interfaces file.

SurferTim

Both usb devices have the same subnet. Run this from a console:

Code: Select all

route

The device with the lowest metric will be used for that subnet.

My advice is use different subnets on each usb device.

Edit: Or bridge the two usb interfaces. I haven't tried this.

SurferTim

peewee2 wrote: I created another SD card with the stretch-lite 2017-11-29 image
Installed and can confirm that every line in sshd_config is commented out, so ssh will not work

That is untrue. I have Stretch lite 2017-11-29, and even tho most lines are commented out. many aren't.

Mine works.

SurferTim

If you find the onboard wireless is not powerful enough, the Alfa brand makes some 500mw to 2000mw units. I know the 2000mw unit works as an AP.

SurferTim

CharlyDelta wrote: Do you think this is feasible?

You can't connect two access points. Your best bet may be to use two wifi modules on rpi2a (one ap and the other a client) and route everything.

SurferTim

/etc/rc.local?

SurferTim

Maybe autostart?
/home/pi/.config/lxsession/LXDE-pi/autostart

SurferTim

So you tried my suggestion and it failed?

Does /etc/resolv.conf show the new dns servers?

SurferTim

I don't see where a dhclient service is running.

If you want to add dns servers, open /etc/dhcpcd.conf with a text editor and add this at the end. This adds google dns servers.

Code: Select all

static domain_name_servers=8.8.8.8 8.8.4.4

Reboot.

SurferTim

According to your output from the dhcpcd service status, something is wrong starting here: Feb 09 08:42:59 raspberrypi dhcpcd[373]: Too few arguments. Feb 09 08:42:59 raspberrypi dhcpcd[373]: Too few arguments. Feb 09 08:42:59 raspberrypi systemd[1]: Started dhcpcd on all interfaces. Feb 09 08:42:59...

SurferTim

A web hosting company that supports a SQL database.

SurferTim

Oh. If you are using Stretch, you cannot add a wireless client interface (station mode) to a bridge.

SurferTim

Have you read this? Maybe it will help you.
https://www.raspberrypi.org/documentati ... s-point.md

SurferTim

Did you install a dhcp server on wlan0? If your wireless clients are getting a 169.254.x.x ip, then probably not.

If you want a dhcp server on your ap, I recommend dnsmasq.

SurferTim

n67 wrote:
You do not need to disable the dhcpcd service to prevent it from obtaining network settings.

To prevent an interface like eth0 from getting an IP...
Why would anyone want to do that???

You must do that when setting up a bridge access point. Only the bridge should have network settings.

SurferTim

If you put entries in /etc/network/interfaces, you will have problems with the dhcpcd service in Stretch.

I guess you didn't read the comments at the top of that file.

# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

Search found 1766 matches

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