cleanup heartbeat threads from scripts and test_canfd (commaai#1036)

* clean

* remove disable

Author: briskspirit

tests/canfd/test_canfd.py

@@ -2,7 +2,6 @@
 import os
 import time
 import random
-import _thread
 from collections import defaultdict
 from panda import Panda
 from panda_jungle import PandaJungle  # pylint: disable=import-error
@@ -18,19 +17,9 @@
 
 _panda_serials = []
 
-def start_heartbeat_thread(p):
-  def heartbeat_thread(p):
-    while True:
-      try:
-        p.send_heartbeat()
-        time.sleep(.5)
-      except Exception:
-        break
-  _thread.start_new_thread(heartbeat_thread, (p,))
 
 def panda_init(serial, enable_canfd=False):
   p = Panda(serial=serial)
-  start_heartbeat_thread(p)
   p.set_power_save(False)
   for bus in range(3):
     if enable_canfd:

tests/echo.py

@@ -1,27 +1,14 @@
 #!/usr/bin/env python3
 import os
 import sys
-import time
-import _thread
 
 sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))
 from panda import Panda  # noqa: E402
 
 # This script is intended to be used in conjunction with the echo_loopback_test.py test script from panda jungle.
 # It sends a reversed response back for every message received containing b"test".
-
-def heartbeat_thread(p):
-  while True:
-    try:
-      p.send_heartbeat()
-      time.sleep(0.5)
-    except Exception:
-      continue
-
-# Resend every CAN message that has been received on the same bus, but with the data reversed
 if __name__ == "__main__":
   p = Panda()
-  _thread.start_new_thread(heartbeat_thread, (p,))
   p.set_safety_mode(Panda.SAFETY_ALLOUTPUT)
   p.set_power_save(False)