Merge pull request #3 from NVIDIA-AI-IOT/master

Merge back

jetbot/apps/stats.py

@@ -32,8 +32,16 @@
 # 128x32 display with hardware I2C:
 disp = Adafruit_SSD1306.SSD1306_128_32(rst=None, i2c_bus=1, gpio=1) # setting gpio to 1 is hack to avoid platform detection
 
-# Initialize library.
-disp.begin()
+while True:
+
+    try:
+        # Try to connect to the OLED display module via I2C.
+        disp.begin()
+    except OSError as err:
+        print("OS error: {0}".format(err))
+        time.sleep(10)
+    else:
+        break
 
 # Clear display.
 disp.clear()

jetbot/utils/utils.py

@@ -25,11 +25,24 @@ def platform_is_nano():
 
 
 def get_ip_address(interface):
-    if get_network_interface_state(interface) == 'down':
+    state = get_network_interface_state(interface)
+    if state == 'down' or state == None:
         return None
+
     cmd = "ifconfig %s | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'" % interface
     return subprocess.check_output(cmd, shell=True).decode('ascii')[:-1]
 
 
 def get_network_interface_state(interface):
-    return subprocess.check_output('cat /sys/class/net/%s/operstate' % interface, shell=True).decode('ascii')[:-1]
+    if not os.path.exists('/sys/class/net/%s/operstate' % interface):
+        #print("%s file does NOT exist" % interface)
+        return None
+
+    try:
+        status = subprocess.check_output('cat /sys/class/net/%s/operstate' % interface, shell=True).decode('ascii')[:-1]
+    except Exception as err:
+        print("Exception: {0}".format(err))
+        return None
+    else:
+        return status
+

notebooks/collision_avoidance/train_model.ipynb

@@ -271,9 +271,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.2"
+   "version": "3.6.9"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }