add simple script to plot values to shell

client/fetch.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+import usb.core
+import usb.util
+import time
+
+CUSTOM_RQ_ECHO = 0 # send back wValue and wIndex, for testing comms reliability
+CUSTOM_RQ_RESET = 1 # reset to bootloader
+CUSTOM_RQ_GET = 2 # get ldr value
+
+def is_target_device(dev):
+    if dev.manufacturer == "xythobuz.de" and dev.product == "AutoBrightness":
+        return True
+    return False
+
+# find our device
+dev = usb.core.find(idVendor=0x16c0, idProduct=0x05dc, custom_match=is_target_device)
+
+# was it found?
+if dev is None:
+    raise ValueError('Device not found')
+
+# configure the device
+dev.set_configuration()
+
+def read_u32(req, a=0, b=0):
+    r = dev.ctrl_transfer(usb.util.CTRL_TYPE_VENDOR | usb.util.CTRL_IN, req, a, b, 4)
+    return int.from_bytes(r, "little")
+
+# check for proper connectivity
+if read_u32(CUSTOM_RQ_ECHO, 42, 23) != (42 | (23 << 16)):
+    raise ValueError("invalid echo response")
+
+# repeatedly print value
+while True:
+    r = read_u32(CUSTOM_RQ_GET)
+    print(time.time(), ";", r, flush=True)
+    time.sleep(0.25)

client/plot.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# https://github.com/tenox7/ttyplot
+
+# enter script directory
+cd "$(dirname "$0")"
+
+./fetch.py | ttyplot -t "Brightness"