keyboard_mouse_emulate_on_embed/keyboard/send_string.py

import os  # used to all external commands
import sys  # used to exit the script
import dbus
import dbus.service
import dbus.mainloop.glib
import RPi.GPIO as GPIO
import time
import thread
import keymap


class BtkStringClient():
	# constants
	KEY_DOWN_TIME = 0.01
	KEY_DELAY = 0.01

	def __init__(self):
		# the structure for a bt keyboard input report (size is 10 bytes)
		self.state = [
			0xA1,  # this is an input report
			0x01,  # Usage report = Keyboard
			# Bit array for Modifier keys
			[0,  # Right GUI - Windows Key
				0,  # Right ALT
				0,  # Right Shift
				0,  # Right Control
				0,  # Left GUI
				0,  # Left ALT
				0,  # Left Shift
				0],  # Left Control
			0x00,  # Vendor reserved
			0x00,  # rest is space for 6 keys
			0x00,
			0x00,
			0x00,
			0x00,
			0x00]
		self.scancodes = {" ": "KEY_SPACE"}
		# connect with the Bluetooth keyboard server
		print "setting up DBus Client"
		self.bus = dbus.SystemBus()
		self.btkservice = self.bus.get_object('org.yaptb.btkbservice','/org/yaptb/btkbservice')
		self.iface = dbus.Interface(self.btkservice,'org.yaptb.btkbservice')

	def send_key_state(self):
		"""sends a single frame of the current key state to the emulator server"""
		bin_str=""
		element=self.state[2]
		for bit in element:
			bin_str += str(bit)
		self.iface.send_keys(int(bin_str,2),self.state[4:10]  )

	def send_key_down(self, scancode):
		"""sends a key down event to the server"""
		self.state[4]=scancode
		self.send_key_state()

	def send_key_up(self):
		"""sends a key up event to the server"""
		self.state[4]=0
		self.send_key_state()

	def send_string(self, string_to_send):
		for c in string_to_send:
			cu = c.upper()
			if(cu in self.scancodes):
				scantablekey = self.scancodes[cu]
			else:
				scantablekey = "KEY_"+c.upper()
			print scantablekey
			scancode = keymap.keytable[scantablekey]
			self.send_key_down(scancode)
			time.sleep( BtkStringClient.KEY_DOWN_TIME)
			self.send_key_up()
			time.sleep( BtkStringClient.KEY_DELAY)

if __name__ == "__main__":

	if(len(sys.argv) < 2):
		print "Usage: send_string <string to send "
		exit()
	print "Setting up GPIO Bluetooth kb emulator client"
	dc = BtkStringClient()
	string_to_send = sys.argv[1]
	print "Sending " + string_to_send
	dc.send_string(string_to_send)
	print "Done."