fingerprinting: bump CAN fingerprinting time and drain socket (#24694)

* add debugging script

* debug

* remove

* add comment

* timestamp CAN fingerprinting (to get time needed to wait for radar)

* comment

* need this to log

* just in case, log first can packet logMonoTime

* clean up

* clean up

* bump fingerprint time to 250ms

bump fingerprint time to 250ms

* comment

selfdrive/car/car_helpers.py

@@ -122,10 +122,13 @@ def fingerprint(logcan, sendcan):
   finger = gen_empty_fingerprint()
   candidate_cars = {i: all_legacy_fingerprint_cars() for i in [0, 1]}  # attempt fingerprint on both bus 0 and 1
   frame = 0
-  frame_fingerprint = 10  # 0.1s
+  frame_fingerprint = 25  # 0.25s
   car_fingerprint = None
   done = False
 
+  # drain CAN socket so we always get the latest messages
+  messaging.drain_sock_raw(logcan)
+
   while not done:
     a = get_one_can(logcan)