Re: [gpsd-dev] GPSD Shared Memory Flags

[Franco Diego]

Hello,

I'm still looking for solutions for the below email I sent some time ago, anybody knows what's the current development status for "set" flag status in gps_data_t data structure when using shared memory flags?

Thank you!

Diego

On October 12, 2016 at 1:24 PM Franco Diego <address@hidden> wrote:

Hello guys,

I'm writing this email to see if you could light my way in checking correctly the "set" flags in gps_data_t when using shared memory.

I setup GPSD in a beaglebone and "cgps" module works and also I'm using the C++ libgpsmm library where I can read GPS position and time through the gps_data_t, however when it comes to check the "set" flags in gps_data_t, these flags are not being set for every packet as follows, I have attached the code that I'm testing.

-----Shared Memory:

1. When I get the below packets (every second), the STATUS_SET is the only flag on in set member of the gps_data_t struct, and I see that lat, long, time, etc changes and still no more flags set here

{"class:":"TPV","tag":"RMC","device":"...."......        

set flag : '0b1000000000'

2. When I get the below packet (every 5 seconds), the set member in gps_data_t struct is:

{"class:":"SKY","tag":"GSV","device":"...."......

set flag : '0b10000000001000100000000010'

-----Sockets:

1. When I test the code with sockets instead of shared memory,  for the following packets, the flags seem to look OK, since they lat, long, etc flags are set

{"class:":"TPV","tag":"RMC","device":"...."......        

set flag: '0b10000001010011011111111100'

2. When I get the below packet (every 5 seconds), the set member in gps_data_t struct is:

{"class:":"SKY","tag":"GSV","device":"...."......

set flag : '0b10000001011011011111111100'

Do you know why when testing with shared memory why the TIME_SET, LATLON_SET, ALTITUDE_SET, SPEED_SET, set flags in gps_data_t are not being set even though I'm getting updates on the shared memory (different data every second)? this works with sockets as shown above.

I really appreciate your time,

Thank you!

Diego