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Added NanoVNA-F_V2 recognition and screenshots

NanoVNASaver/Hardware/NanoVNA_F_V2.py

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+import logging
+from NanoVNASaver.Hardware.Serial import drain_serial, Interface
+import serial
+import struct
+import numpy as np
+from PyQt5 import QtGui
+
+from NanoVNASaver.Hardware.NanoVNA import NanoVNA
+
+logger = logging.getLogger(__name__)
+
+
+class NanoVNA_F_V2(NanoVNA):
+    name = "NanoVNA-F_V2"
+    screenwidth = 800
+    screenheight = 480
+
+    def  _capture_data(self) -> bytes:
+        timeout = self.serial.timeout
+        with self.serial.lock:
+            drain_serial(self.serial)
+            timeout = self.serial.timeout
+            self.serial.write("capture\r".encode('ascii'))
+            self.serial.readline()
+            self.serial.timeout = 4
+            image_data = self.serial.read(
+                self.screenwidth * self.screenheight * 2)
+            self.serial.timeout = timeout
+        self.serial.timeout = timeout
+        return image_data
+
+    def getScreenshot(self) -> QtGui.QPixmap:
+        logger.debug("Capturing screenshot...")
+        if not self.connected():
+            return QtGui.QPixmap()
+        try:
+            rgba_array = self._capture_data()
+            image = QtGui.QImage(
+                rgba_array,
+                self.screenwidth, self.screenheight,
+                QtGui.QImage.Format_RGB16)
+            logger.debug("Captured screenshot")
+            return QtGui.QPixmap(image)
+        except serial.SerialException as exc:
+            logger.exception("Exception while capturing screenshot: %s", exc)
+        return QtGui.QPixmap()