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Re: [Paparazzi-devel] XBee with Paparazzi

From: Simon Liebold
Subject: Re: [Paparazzi-devel] XBee with Paparazzi
Date: Thu, 02 Oct 2014 22:29:13 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.1.2


I am not sure what the reason for not accepting the telemetry setting commands is. Well, until recently I experienced sporadic problems sending commands to the UAV while it was in flight (not on the bench). It sometimes required three or four attempts until it would accept a setting. The receiving data was affected as well. I had gaps up to 15 seconds before I would receive a new position report. Replacing the ground station antenna with a much larger one seems to have fixed that. My airborne modem is the one with the wire antenna.

It seems that you already found the configuration page in the wiki. I once set the two modems to the recommended settings (+symmetric encryption, available in "Series 2") and never touched it since.

On both the ground and the airborne side I use sockets for the modem modules that each have blinking LEDs for in- and outbound data. Something like this may also help for debugging.

Sorry that I cannot be of more help.


Am 02.10.2014 um 12:51 schrieb John Voegeli:

Thanks for responding. I had the data link set for API mode which apparently wasn’t working with my Xbees… Once I commented out the API mode in the control_panel.xml it immediately came up, but It looks like I only have Rx data into the Ground Control Station. I cannot send commands or change the telemetry settings without the USB-Serial cable. Could this be another setting issue?


From: Simon Liebold <address@hidden>
Reply-To: Paparazzi UAV devel list <address@hidden>
Date: Thursday, October 2, 2014 at 12:46 PM
To: Paparazzi UAV devel list <address@hidden>
Subject: Re: [Paparazzi-devel] XBee with Paparazzi


If the GCS window stays at "waiting for telemetry" and the screen remains black have a look at the Paparazzi Center (from where you started the session). Did the "Data Link" terminate immediately? Is there any error indicating that it had trouble opening a device?

For example:

Also (assuming this is Linux) do a

$ tail -f /var/log/syslog

and see if the new device is being created as you plug in the ground station in the USB port (and likewise being removed as you unplug it).


Am 01.10.2014 um 23:18 schrieb John Voegeli:

Quick question… I am almost finished with my quad, I am just having trouble getting the Xbees to link up. I configured them to 57600 baud and the GCS is the coordinator and the Quad is the end unit… I also made sure my Udev rules matched up so I could use the Xbee from the dropdown list in the GCS. However, It continues to say waiting for telemetry and never links up.


When using X-CTU in windows I can see the other device and get some RSSI light and activity, but when plugged into Ubuntu there is no traffic. I am using the FTDI usb to serial so I know the drivers are right. Any ideas at all?




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