fwupd: fix after py3k migration

Sadly bleak link implementation doesn't seem to work good enough to
flash yet, but fwupd of ESC and BLE over serial has been confirmed to
work fine.

fwupd.py

@@ -17,7 +17,7 @@ PING_RETRIES = 20
 
 def checksum(s, data):
     for c in data:
-        s += ord(c)
+        s += c
     return s & 0xFFFFFFFF
 
 
@@ -99,7 +99,7 @@ parser.add_argument(
     "--interface",
     help="communication interface, default: %(default)s",
     type=str.lower,
-    choices=("ble", "serial", "tcp", "blefleet"),
+    choices=("ble", "serial", "tcp", "blefleet", "bleak"),
     default="ble",
 )
 
@@ -149,6 +149,12 @@ elif args.interface == "blefleet":
     except:
         exit("BLE is not supported on your system !")
     link = BLELink()
+elif args.interface == "bleak":
+    try:
+        from py9b.link.bleak import BleakLink
+    except:
+        exit("BLE is not supported on your system !")
+    link = BleakLink()
 else:
     exit("!!! BUG !!! Unknown interface selected: " + args.interface)
 

py9b/command/base.py

@@ -7,7 +7,7 @@ class InvalidResponse(Exception):
 
 
 class BaseCommand(object):
-    def __init__(self, src=BT.HOST, dst=0, cmd=0, arg=0, data="", has_response=True):
+    def __init__(self, src=BT.HOST, dst=0, cmd=0, arg=0, data=bytearray(), has_response=True):
         self.has_response = has_response
         self.request = PKT(src, dst, cmd, arg, data)
 

py9b/link/bleak.py

@@ -92,7 +92,9 @@ class BleakLink(BaseLink):
         fut.result(10)
 
     async def _connect(self, port):
-        self._client = BleakClient(port[1], device=self.device)
+        if isinstance(port, tuple):
+            port = port[1]
+        self._client = BleakClient(port, device=self.device)
         await self._client.connect()
         print("connected")
         await self._client.start_notify(_tx_char_uuid, self._data_received)

py9b/transport/base.py

@@ -31,7 +31,7 @@ class BaseTransport(object):
     def recv(self):
         raise NotImplementedError()
 
-    def send(self, src, dst, cmd, arg, data=""):
+    def send(self, src, dst, cmd, arg, data=bytearray()):
         raise NotImplementedError()
 
     def execute(self, command):

py9b/transport/packet.py

@@ -3,7 +3,7 @@ from .base import BaseTransport as BT
 
 
 class BasePacket(object):
-    def __init__(self, src=0, dst=0, cmd=0, arg=0, data=""):
+    def __init__(self, src=0, dst=0, cmd=0, arg=0, data=bytearray()):
         self.src = src
         self.dst = dst
         self.cmd = cmd