Re: [gpsd-users] Cannot get data from daemon

[Gabi Kelemen]

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Hi Rob,

Thanks for the answer.
Now that I run the gpsd as root it seems to work correctly.

Gabi.

- -----Original Message-----
From: Robert Calhoun [mailto:address@hidden
Sent: Tuesday, May 27, 2014 7:33 PM
To: Gabi Kelemen; address@hidden
Subject: Re: [gpsd-users] Cannot get data from daemon

>
> From:  Gabi Kelemen <address@hidden>
> Date:  27 May 2014 3:26 AM
> To:  "address@hidden" <address@hidden>
> Subject:  [gpsd-users] Cannot get data from daemon
>
>
> Hi,
> I¹m using gpsd 3.9 on an ARM embedded system.
> My GPS is embedded on Cinterion PHS8 module.
> I open the gpsd with: gpsd /dev/ttyUSB1 ­n.
> When I use Œtop¹ cmd, it seems that it is opened correctly with SYS
>privileges.
> I use gps_stream() only with JSON flag.
> In order to perform the reading I use gps_waiting() with 50 seconds
>and then gps_read().
> The problem is that I can¹t read any data although I can see the data
>when I Œcat /dev/ttyUSB1¹.
> Does anyone have any suggestions?
> Thank you,
> Gabi.

I would first try to make sure that gpsd is successfully talking to the device.

1) make sure no other process is using the device
2) try running in the foreground with debugging level set to something high

gpsd -nND6 /dev/ttyUSB1

If that works, do the same thing without -N and monitor syslog for problems.
Note as a daemon gpsd drops to an unprivileged account before opening the 
device; if you need to run commands to power up the gps as root, that will have 
to be done before starting gpsd.

Rob Calhoun

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