laikad: use non-conflating socket for gnss msgs (#24888)

* Use subsock

* wait for one

* wrong name

* try cpp proc replay

* fix recv pattern

---------

Co-authored-by: Bruce Wayne <harald.the.engineer@gmail.com>
Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>
old-commit-hash: fc5a575ba3

selfdrive/locationd/laikad.py

@@ -425,12 +425,13 @@ def main(sm=None, pm=None):
 
   use_qcom = not Params().get_bool("UbloxAvailable", block=True)
   if use_qcom:
-    raw_gnss_socket = "qcomGnss"
+    raw_name = "qcomGnss"
   else:
-    raw_gnss_socket = "ubloxGnss"
+    raw_name = "ubloxGnss"
+  raw_gnss_sock = messaging.sub_sock(raw_name, conflate=False, timeout=1000)
 
   if sm is None:
-    sm = messaging.SubMaster([raw_gnss_socket, 'clocks'])
+    sm = messaging.SubMaster(['clocks',])
   if pm is None:
     pm = messaging.PubMaster(['gnssMeasurements'])
 
@@ -444,18 +445,17 @@ def main(sm=None, pm=None):
   laikad = Laikad(save_ephemeris=not replay, auto_fetch_navs=use_internet, use_qcom=use_qcom)
 
   while True:
-    sm.update()
-
-    if sm.updated[raw_gnss_socket]:
-      gnss_msg = sm[raw_gnss_socket]
-      msg = laikad.process_gnss_msg(gnss_msg, sm.logMonoTime[raw_gnss_socket], replay)
-      pm.send('gnssMeasurements', msg)
+    for in_msg in messaging.drain_sock(raw_gnss_sock):
+      out_msg = laikad.process_gnss_msg(getattr(in_msg, raw_name), in_msg.logMonoTime, replay)
+      pm.send('gnssMeasurements', out_msg)
 
+    sm.update(0)
     if not laikad.got_first_gnss_msg and sm.updated['clocks']:
       clocks_msg = sm['clocks']
       t = GPSTime.from_datetime(datetime.utcfromtimestamp(clocks_msg.wallTimeNanos * 1E-9))
       if laikad.auto_fetch_navs:
         laikad.fetch_navs(t, block=replay)
 
+
 if __name__ == "__main__":
   main()