How do I use gpsdecode to output the results of gpscat in a readable manner?

Question

I am connected to a processor with GPS attached through a USB-serial port. What I've been trying to do is read the GPS data by doing:

gpscat /dev/ttyS2 | gpsdecode

However, it's very slow and after a long time it outputs this:

130 root@gw-0317STLG0067 ~ # gpscat /dev/ttyS2 | gpsdecode            
:(
{"class":"SKY","device":"stdin","vdop":1.20,"hdop":1.20,"pdop":1.80,"satellites":[{"PRN":29,"el":28,"az":79,"ss":39,"used":false},{"PRN":31,"el":18,"az":204,"ss":18,"used":false}]}

When I kill the process, this is what it outputs:

close failed in file object destructor: 
sys.excepthook is missing 
lost sys.stderr

Is this the right command to use? If so, what's the problem?

Edit ---- New

Output{"class":"TPV","device":"stdin","mode":2,"lat":50.782431667,"lon":6.076753333} {"class":"SKY","device":"stdin","satellites":[{"PRN":27,"el":86,"az":124,"ss":30,"used":false}]} {"class":"TPV","device":"stdin","mode":2,"lat":50.782431667,"lon":6.076753333} {"class":"TPV","device":"stdin","mode":2,"lat":50.782431667,"lon":6.076753333} {"class":"TPV","device":"stdin","mode":2,"lat":50.782431667,"lon":6.076753333} {"class":"TPV","device":"stdin","mode":2,"time":"2017-07-17T14:52:13.000Z","ept":0.005,"lat":50.782431667,"lon":6.076753333,"track":206.8000,"speed":0.000} {"class":"SKY","device":"stdin","vdop":1.60,"hdop":1.00,"pdop":2.00,"satellites":[{"PRN":7,"el":10,"az":289,"ss":19,"used":false},{"PRN":8,"el":54,"az":296,"ss":19,"used":false},{"PRN":10,"el":59,"az":122,"ss":43,"used":false},{"PRN":15,"el":11,"az":38,"ss":43,"used":false},{"PRN":27,"el":84,"az":126,"ss":34,"used":false}]} {"class":"SKY","device":"stdin","vdop":1.60,"hdop":1.00,"pdop":2.00,"satellites":[{"PRN":7,"el":10,"az":289,"ss":19,"used":false},{"PRN":8,"el":54,"az":296,"ss":19,"used":false},{"PRN":10,"el":59,"az":122,"ss":43,"used":false},{"PRN":15,"el":11,"az":38,"ss":43,"used":false},{"PRN":27,"el":84,"az":126,"ss":34,"used":false},{"PRN":27,"el":84,"az":126,"ss":34,"used":false}]} {"class":"SKY","device":"stdin","vdop":1.60,"hdop":1.00,"pdop":2.00,"satellites":[{"PRN":7,"el":10,"az":288,"ss":17,"used":false},{"PRN":8,"el":55,"az":296,"ss":22,"used":false},{"PRN":10,"el":60,"az":120,"ss":41,"used":false},{"PRN":15,"el":10,"az":37,"ss":45,"used":false},{"PRN":16,"el":35,"az":188,"ss":25,"used":false},{"PRN":18,"el":46,"az":70,"ss":40,"used":false},{"PRN":21,"el":23,"az":71,"ss":38,"used":false},{"PRN":26,"el":10,"az":175,"ss":24,"used":false},{"PRN":27,"el":84,"az":126,"ss":33,"used":false}]} {"class":"SKY","device":"stdin","vdop":1.60,"hdop":1.00,"pdop":2.00,"satellites":[{"PRN":7,"el":10,"az":288,"ss":17,"used":false},{"PRN":8,"el":55,"az":296,"ss":22,"used":false},{"PRN":10,"el":60,"az":120,"ss":41,"used":false},{"PRN":15,"el":10,"az":37,"ss":45,"used":false},{"PRN":16,"el":35,"az":188,"ss":25,"used":false},{"PRN":18,"el":46,"az":70,"ss":40,"used":false},{"PRN":21,"el":23,"az":71,"ss":38,"used":false},{"PRN":26,"el":10,"az":175,"ss":24,"used":false},{"PRN":27,"el":84,"az":126,"ss":33,"used":false},{"PRN":70,"el":14,"az":23,"ss":25,"used":false},{"PRN":86,"el":39,"az":82,"ss":32,"used":true},{"PRN":65,"el":0,"az":174,"ss":19,"used":false},{"PRN":71,"el":47,"az":70,"ss":29,"used":true},{"PRN":72,"el":35,"az":142,"ss":29,"used":true}]}

Answer 1

If so, what's the problem?

It appears as though you're killing the gpsdecode process, which was reading gpscat's output. When it stopped reading, the output buffer for gpscat filled up. When the kill signal got to the gpscat process, python tried to close the non-empty output handle, it failed with that message, as seen in the linked Stack Overflow Q&A.

To avoid this particular error, you could try killing the gpscat process instead of the gpsdecode process.