Fix error with new firmware version by changing command flow

    Inside _send_command, read until response doesn't start by 0x00

liquidctl/driver/commander_core.py

@@ -199,10 +199,9 @@ def _get_temps(self):
         return temps
 
     def _read_data(self, mode, data_type):
-        self._send_command(_CMD_RESET)
         self._send_command(_CMD_SET_MODE, mode)
         raw_data = self._send_command(_CMD_READ)
-
+        self._send_command(_CMD_RESET)
         if tuple(raw_data[3:5]) != data_type:
             raise ExpectationNotMet('device returned incorrect data type')
 
@@ -227,7 +226,10 @@ def _send_command(self, command, data=()):
         self.device.clear_enqueued_reports()
         self.device.write(buf)
 
-        buf = bytes(self.device.read(_RESPONSE_LENGTH))
+        res = self.device.read(_RESPONSE_LENGTH)
+        while res[0] != 0x00:
+            res = self.device.read(_RESPONSE_LENGTH)        
+        buf = bytes(res)
         assert buf[1] == command[0], 'response does not match command'
         return buf
 
@@ -242,7 +244,6 @@ def _wake_device_context(self):
     def _write_data(self, mode, data_type, data):
         self._read_data(mode, data_type)  # Will ensure we are writing the correct data type to avoid breakage
 
-        self._send_command(_CMD_RESET)
         self._send_command(_CMD_SET_MODE, mode)
 
         buf = bytearray(len(data) + len(data_type) + 4)
@@ -251,6 +252,7 @@ def _write_data(self, mode, data_type, data):
         buf[4 + len(data_type):] = data
 
         self._send_command(_CMD_WRITE, buf)
+        self._send_command(_CMD_RESET)
 
     def _fan_to_channel(self, fan):
         if self._has_pump: