BLE: Show name of device which is connected / is trying to pair

Tries to read the device name of the central via the GAP Device Name characteristic. If there is a device name available, it will be shown on the screen. Even if it only becomes available at a later time during pairing.

This is how it looks now:

preload/apps/ble/__init__.py

@@ -9,6 +9,10 @@ import config
 ble_event = None
 is_active = False
 
+STATE_IDLE = 1
+STATE_NUMERIC_COMPARISON = 2
+STATE_WAIT_FOR_COMPLETION = 3
+STATE_FAIL = 4
 
 def ble_callback(_):
     global ble_event
@@ -74,7 +78,7 @@ def selector():
 
 try:
     active = config.get_string("ble_enable")
-    if active == "true" or active == "1":
+    if active.lower() == "true" or active == "1":
         is_active = True
 except OSError:
     pass
@@ -82,7 +86,7 @@ except OSError:
 
 init()
 disp = display.open()
-state = 1
+state = STATE_IDLE
 v_old = buttons.read()
 
 while True:
@@ -90,7 +94,7 @@ while True:
     v = ~v_old & v_new
     v_old = v_new
 
-    if state == 1:
+    if state == STATE_IDLE:
         # print config screen
         disp.clear()
         headline()
@@ -100,12 +104,11 @@ while True:
         # wait for button press or ble_event
         if ble_event == sys_ble.EVENT_HANDLE_NUMERIC_COMPARISON:
             ble_event = None
-            state = 3
+            state = STATE_NUMERIC_COMPARISON
         if v & buttons.TOP_RIGHT:
             toggle()
-            # state = 1
 
-    elif state == 3:
+    elif state == STATE_NUMERIC_COMPARISON:
         # print confirmation value
         compare_value = sys_ble.get_compare_value()
         disp.clear()
@@ -125,23 +128,23 @@ while True:
         # wait for button press or ble_event
         if ble_event == sys_ble.EVENT_PAIRING_FAILED:
             ble_event = None
-            state = 6
+            state = STATE_FAIL
         if v & buttons.BOTTOM_LEFT:
             sys_ble.confirm_compare_value(True)
             disp.clear()
             disp.print("BLE Pairing", posy=0, fg=[0, 0, 255])
             disp.print("Please Wait", posy=40, fg=[255, 255, 255])
             disp.update()
-            state = 5
+            state = STATE_WAIT_FOR_COMPLETION
         elif v & (buttons.BOTTOM_RIGHT | buttons.TOP_RIGHT):
             sys_ble.confirm_compare_value(False)
-            state = 6
+            state = STATE_FAIL
 
-    elif state == 5:
+    elif state == STATE_WAIT_FOR_COMPLETION:
         # Wait for pairing to complete
         if ble_event == sys_ble.EVENT_PAIRING_FAILED:
             ble_event = None
-            state = 6
+            state = STATE_FAIL
         elif ble_event == sys_ble.EVENT_PAIRING_COMPLETE:
             ble_event = None
             pairing_name = sys_ble.get_last_pairing_name().split("/")[-1].split(".")[0]
@@ -154,13 +157,13 @@ while True:
             time.sleep(5)
             os.exec("main.py")
 
-    elif state == 6:
+    elif state == STATE_FAIL:
         # display fail screen and wait 5 seconds
         disp.clear()
         disp.print("BLE Pairing", posy=0, fg=[0, 0, 255])
         disp.print("   Fail", posy=40, fg=[255, 0, 0])
         disp.update()
         time.sleep(5)
-        state = 1
+        state = STATE_IDLE
 
     time.sleep(0.1)