keyboard_comm: error out if unsupported protocol

src/main/python/keyboard_comm.py

@@ -12,6 +12,9 @@ from macro_action import SS_TAP_CODE, SS_DOWN_CODE, SS_UP_CODE, ActionText, Acti
 from unlocker import Unlocker
 from util import MSG_LEN, hid_send, chunks
 
+SUPPORTED_VIA_PROTOCOL = [-1, 9]
+SUPPORTED_VIAL_PROTOCOL = [-1, 0, 1, 2, 3]
+
 CMD_VIA_GET_PROTOCOL_VERSION = 0x01
 CMD_VIA_GET_KEYBOARD_VALUE = 0x02
 CMD_VIA_SET_KEYBOARD_VALUE = 0x03
@@ -53,6 +56,10 @@ CMD_VIAL_LOCK = 0x08
 BUFFER_FETCH_CHUNK = 28
 
 
+class ProtocolError(Exception):
+    pass
+
+
 def macro_deserialize_v1(data):
     """
     Deserialize a single macro, protocol version 1
@@ -205,6 +212,10 @@ class Keyboard:
         data = self.usb_send(self.dev, struct.pack("B", CMD_VIA_GET_PROTOCOL_VERSION), retries=20)
         self.via_protocol = struct.unpack(">H", data[1:3])[0]
 
+    def check_protocol_version(self):
+        if self.via_protocol not in SUPPORTED_VIA_PROTOCOL or self.vial_protocol not in SUPPORTED_VIAL_PROTOCOL:
+            raise ProtocolError()
+
     def reload_layout(self, sideload_json=None):
         """ Requests layout data from the current device """
 
@@ -235,6 +246,8 @@ class Keyboard:
 
             payload = json.loads(lzma.decompress(payload))
 
+        self.check_protocol_version()
+
         self.definition = payload
 
         if "vial" in payload:

src/main/python/main_window.py

@@ -10,6 +10,7 @@ from urllib.request import urlopen
 
 from editor_container import EditorContainer
 from firmware_flasher import FirmwareFlasher
+from keyboard_comm import ProtocolError
 from keymap_editor import KeymapEditor
 from keymaps import KEYMAPS
 from layout_editor import LayoutEditor
@@ -216,12 +217,16 @@ class MainWindow(QMainWindow):
             self.current_device = self.devices[idx]
 
         if self.current_device is not None:
-            if self.current_device.sideload:
-                self.current_device.open(self.sideload_json)
-            elif self.current_device.via_stack:
-                self.current_device.open(self.via_stack_json["definitions"][self.current_device.via_id])
-            else:
-                self.current_device.open(None)
+            try:
+                if self.current_device.sideload:
+                    self.current_device.open(self.sideload_json)
+                elif self.current_device.via_stack:
+                    self.current_device.open(self.via_stack_json["definitions"][self.current_device.via_id])
+                else:
+                    self.current_device.open(None)
+            except ProtocolError:
+                QMessageBox.warning(self, "", "Unsupported protocol version!\n"
+                                              "Please download latest Vial from https://get.vial.today/")
 
             if isinstance(self.current_device, VialKeyboard) \
                     and self.current_device.keyboard.keyboard_id in EXAMPLE_KEYBOARDS: