binding: gps: add gpsd.socket race condition fix

Try up to 5 times with a 2500 ms interval to read data after
a subscription to gpsd stream. This assures an initial connection
to the gpsd.socket is in a known state.

Bug-AGL: SPEC-832
Change-Id: Ice74c8372e2f592a353f1bd43ddde7d447ab0c8d
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/binding/afm-gps-binding.c b/binding/afm-gps-binding.c
index ffc787b..7fbd907 100644
--- a/binding/afm-gps-binding.c
+++ b/binding/afm-gps-binding.c
@@ -183,7 +183,7 @@ static void *data_poll(void *ptr)
 static int init()
 {
 	const char *host, *port;
-	int ret;
+	int ret, tries = 5;
 
 	location_event = afb_daemon_make_event("location");
 
@@ -196,6 +196,11 @@ static int init()
 
 	gps_stream(&data, WATCH_ENABLE | WATCH_JSON, NULL);
 
+	// due to the gpsd.socket race condition need to loop till initial event
+	do {
+		gps_read(&data);
+	} while (!gps_waiting(&data, MSECS_TO_USECS(2500)) && tries--);
+
 	return pthread_create(&thread, NULL, &data_poll, NULL);
 }