Add grab_log script

Makefile

@@ -33,7 +33,7 @@ simulator: build_simulator
 	gazebo --verbose ${CURDIR}/gazebo/flix.world
 
 grab_log:
-	tools/grab_log.py
+	PORT=$(PORT) tools/grab_log.py
 
 clean:
 	rm -rf gazebo/plugin/build $(SKETCH)/build $(SKETCH)/cache

tools/grab_log.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# grab flight log and save to file
+
+import datetime
+import serial
+import os
+
+PORT = os.environ['PORT']
+DIR = os.path.dirname(os.path.realpath(__file__))
+
+dev = serial.Serial(port=PORT, baudrate=115200, timeout=0.5)
+
+log = open(f'{DIR}/log/{datetime.datetime.now().isoformat()}.csv', 'wb')
+
+print('Downloading log...')
+count = 0
+dev.write('log\n'.encode())
+while True:
+    line = dev.readline()
+    if not line:
+        break
+    log.write(line)
+    count += 1
+    print(f'\r{count} lines', end='')
+
+print(f'\nWritten {os.path.relpath(log.name, os.curdir)}')