Added remote debugger and cleaned up several things Looks good to merge

.gitignore

@@ -112,3 +112,6 @@ venv.bak/
 
 # Pycharms cruft
 .idea
+
+# Personal dev scripts
+.scripts

docs/split_keyboards.md

@@ -4,7 +4,6 @@ UART is supported, though other modes will come later such as Bluetooth and i2c.
 
 Useful config options:
 ```python
-keyboard.split_type = "UART"  # Sets split mode to UART
 keyboard.split_flip = True  # If your boards are identical but one is flipped, this option is for you 
 keyboard.split_offsets = [6, 6, 6, 6]  # This is the how many keys are on each column on the "Master" half
 ```
@@ -34,5 +33,6 @@ from kmk_side import split_side
 # UART
 To enable uart it's as simple as adding this line, of course changing the pin
 ```python
+keyboard.split_type = "UART"
 keyboard.uart = keyboard.init_uart(tx=board.SCL)
 ```

kmk/firmware.py

@@ -63,7 +63,9 @@ class Firmware:
 
     split_offsets = ()
     split_flip = False
+    split_side = None
     split_master_left = True
+    is_master = None
     uart = None
     uart_flip = True
 
@@ -84,6 +86,10 @@ class Firmware:
             self._send_hid()
 
     def _handle_update(self, update):
+        '''
+        Bulk processing of update code for each cycle
+        :param update:
+        '''
         if update is not None:
             self._state.matrix_changed(
                 update[0],
@@ -110,26 +116,39 @@ class Firmware:
             self._state.resolve_macro()
 
     def _send_to_master(self, update):
+        if self.split_master_left:
+            update[1] += self.split_offsets[update[0]]
+        else:
+            update[1] -= self.split_offsets[update[0]]
         if self.uart is not None:
-
-            if self.split_master_left:
-                update[1] += self.split_offsets[update[0]]
-
             self.uart.write(update)
 
     def _receive_from_slave(self):
         if self.uart is not None and self.uart.in_waiting > 0:
             update = bytearray(self.uart.read(3))
-            if self.split_master_left:
-                update[1] -= self.split_offsets[update[0]]
+            # Built in debug mode switch
+            if update == b'DEB':
+                # TODO Pretty up output
+                print(self.uart.readline())
+                return None
             return update
 
         return None
 
+    def _send_debug(self, message):
+        '''
+        Prepends DEB and appends a newline to allow debug messages to
+        be detected and handled differently than typical keypresses.
+        :param message: Debug message
+        '''
+        if self.uart is not None:
+            self.uart.write('DEB')
+            self.uart.write(message, '\n')
+
     def _master_half(self):
         return supervisor.runtime.serial_connected
 
-    def init_uart(self, tx=None, rx=None, timeout=1):
+    def init_uart(self, tx=None, rx=None, timeout=20):
         if self._master_half():
             # If running with one wire, only receive on master
             if rx is None or self.uart_flip:
@@ -146,19 +165,15 @@ class Firmware:
         assert self.col_pins, 'no GPIO pins defined for matrix columns'
         assert self.diode_orientation is not None, 'diode orientation must be defined'
 
+        self.is_master == self._master_half()
+
         if self.split_flip and not self._master_half():
             self.col_pins = list(reversed(self.col_pins))
 
         if self.split_side == "Left":
-            if supervisor.runtime.serial_connected:
-                self.split_master_left = True
-            else:
-                self.split_master_left = False
-        else:
-            if supervisor.runtime.serial_connected:
-                self.split_master_left = False
-            else:
-                self.split_master_left = True
+                self.split_master_left = self.is_master
+        elif self.split_side == "Right":
+            self.split_master_left = not self.is_master
 
         self.matrix = MatrixScanner(
             cols=self.col_pins,

user_keymaps/kdb424/levinson_m4.py

@@ -1,7 +1,7 @@
 import board
 import busio
 
-from kmk.consts import DiodeOrientation, UnicodeModes
+from kmk.consts import DiodeOrientation, LeaderMode, UnicodeModes
 from kmk.keycodes import KC
 from kmk.keycodes import generate_leader_dictionary_seq as glds
 from kmk.macros.simple import send_string
@@ -16,17 +16,18 @@ keyboard.col_pins = (P.D10, P.D9, P.D7, P.D5, P.A4, P.A5)
 keyboard.row_pins = (P.A0, P.A1, P.A2, P.A3)
 keyboard.diode_orientation = DiodeOrientation.COLUMNS
 
-
-# ------------------User level config variables ---------------------------------------
-keyboard.unicode_mode = UnicodeModes.LINUX
-keyboard.tap_time = 350
-keyboard.leader_timeout = 2000
-keyboard.debug_enabled = False
 keyboard.split_type = "UART"
 keyboard.split_flip = True
 keyboard.split_offsets = [6, 6, 6, 6]
-keyboard.uart = keyboard.init_uart(tx=board.TX, rx=board.RX)
 keyboard.uart_flip = False
+keyboard.uart = keyboard.init_uart(tx=board.TX, rx=board.RX)
+
+# ------------------User level config variables ---------------------------------------
+keyboard.leader_mode = LeaderMode.TIMEOUT
+keyboard.unicode_mode = UnicodeModes.LINUX
+keyboard.tap_time = 150
+keyboard.leader_timeout = 2000
+keyboard.debug_enabled = True
 
 emoticons = compile_unicode_string_sequences({
     # Emoticons, but fancier