diff --git a/README.md b/README.md
index d4619e8..aa04a40 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,47 @@
 # pyccsone
 
-Python libary for communication with the Grass Valley CCS-ONE using its xml interface
\ No newline at end of file
+Python libary for communication with the Grass Valley CCS-ONE using its xml interface
+
+
+## Usage:
+### create CCSOne object:
+ccsoneobj = ccsone.CCSOne(IP_ADDRESS, PORT, AUTHNAME, HOTKEYS)
+
+on creation connected devices and cameras are fetched
+responses are handled automatically in a recieve thread
+
+### close connection:
+ccsoneobj.close()
+
+### get device information:
+ccsoneobj.getdeviceinformation()
+
+### add camera object:
+ccsoneobj.addcam(CAMERA_NUMBER)
+
+### subscribe to function:
+ccsoneobj.cams[CAMERA_NUMBER].valuesubscribe(FUNCTION_ID)
+
+### get function value / subscribe if not known:
+ccsoneobj.getfunctionvalue(FUNCTION_ID)
+
+### change function value:
+ccsoneobj.cams[CAMERA_NUMBER].functionvaluechange(FUNCTION_ID, VALUE)
+
+### set tally state:
+ccsoneobj.cams[CAMERA_NUMBER].settally(TALLY_STATE)
+
+### toggle tally state:
+ccsoneobj.cams[CAMERA_NUMBER].toggletally()
+
+### get tally state:
+ccsoneobj.cams[CAMERA_NUMBER].gettally()
+
+### set gain COLOR=>(r,g,b) VALUE=>0-99:
+ccsoneobj.cams[CAMERA_NUMBER].setgain(COLOR, VALUE)
+
+### get gain (r,g,b):
+ccsoneobj.cams[CAMERA_NUMBER].getgain(COLOR)
+
+### get Fstop:
+ccsoneobj.cams[CAMERA_NUMBER].getf()
\ No newline at end of file
diff --git a/pyccsone.py b/pyccsone.py
new file mode 100644
index 0000000..678db38
--- /dev/null
+++ b/pyccsone.py
@@ -0,0 +1,261 @@
+"""
+CCSOne Python libary
+written by Paul Schürholz
+
+Example usage:
+create CCSOne object:
+ccsoneobj = ccsone.CCSOne(IP_ADDRESS, PORT, AUTHNAME, HOTKEYS)
+
+close connection:
+ccsoneobj.closesocket()
+
+get device information:
+ccsoneobj.getdeviceinformation()
+
+add camera object:
+ccsoneobj.addcam(CAMERA_NUMBER)
+
+subscribe to function:
+ccsoneobj.cams[CAMERA_NUMBER].valuesubscribe(FUNCTION_ID)
+
+get function value / subscribe if not known:
+ccsoneobj.getfunctionvalue(FUNCTION_ID)
+
+change function value:
+ccsoneobj.cams[CAMERA_NUMBER].functionvaluechange(FUNCTION_ID, VALUE)
+
+set tally state:
+ccsoneobj.cams[CAMERA_NUMBER].settally(TALLY_STATE)
+
+toggle tally state:
+ccsoneobj.cams[CAMERA_NUMBER].toggletally()
+
+get tally state:
+ccsoneobj.cams[CAMERA_NUMBER].gettally()
+
+set gain COLOR=>(r,g,b) VALUE=>0-99:
+ccsoneobj.cams[CAMERA_NUMBER].setgain(COLOR, VALUE)
+
+get gain (r,g,b):
+ccsoneobj.cams[CAMERA_NUMBER].getgain(COLOR)
+
+get Fstop:
+ccsoneobj.cams[CAMERA_NUMBER].getf()
+
+responses are handled automatically in a recieve thread
+"""
+import socket
+import time
+import xmltodict
+from math import floor, ceil
+from threading import Thread
+import keyboard
+
+# Main Class CCSOne
+class CCSOne:
+  def __init__(self, rip, rport, authname, hotkeys=True):
+    self.rip = rip
+    self.rport = rport
+    self.cams = {}
+    self.devices = {}
+    self.connected = False
+    self.success = False
+    self. requesttimeout = 2.5
+    self.timeout = 5
+    self.name = ""
+    self.location = ""
+    self.authname = authname
+
+    self.initsocket()
+    self.auth(authname)
+    self.getdeviceinformation()
+    if hotkeys:
+      self.setupkeyhooks()
+
+  def __del__(self):
+    self.close()
+
+  def close(self):
+    keyboard.unhook_all()
+    self.closesocket()
+    print("Closed")
+
+  # Subclass for devices such as OCPs
+  class Device:
+    def __init__(self, sessionid, name, devicetype, connectionstate):
+      self.sessionid = sessionid
+      self.name = name
+      self.type = devicetype
+      self.connectionstate = connectionstate
+
+  # Subclass for Camera devices
+  class Cam:
+    def __init__(self, num, ccsone):
+      self.num = num
+      self.ccsone = ccsone
+      self.functions = {}
+
+    # get current gain setting for specified color
+    def getgain(self, color):
+      functionid = {'r': 513, 'g': 514, 'b': 515}
+      return floor(self.getfunctionvalue(functionid[color])/2.56)
+
+    # set gain setting for specified color
+    def setgain(self, color, value):
+      functionid = {'r': 513, 'g': 514, 'b': 515}
+      return self.setfunctionvalue(functionid[color], ceil(value*2.56))
+
+    # get current tally state
+    def gettally(self, invers=True):
+      return bool(not self.getfunctionvalue(8470) if invers else self.getfunctionvalue(8470))
+
+    # set tally state (1=no tally, 0=tally)
+    def settally(self, state, invers=True):
+      return self.setfunctionvalue(8470, int(not state if invers else state))
+
+    def toggletally(self):
+      return self.settally(not self.gettally())
+
+    # get current FStop Value
+    def getf(self):
+      xmltof = {9: "1.8", 11: "2.0", 12: "2.2", 43: "2.4", 13: "2.6", 14: "2.8", 15: "3.1", 44: "3.4", 16: "3.7", 17: "4.0", 18: "4.4", 45: "4.8", 19: "5.2", 20: "5.6", 21: "6.2", 46: "6.7", 22: "7.3", 23: "8.0", 24: "8.7", 47: "9.5", 25: "10.0", 26: "11.0", 27: "12.0", 48: "13.0", 29: "15.0", 29: "16.0", 49: "17.0", 50: "19.0", 30: "21.0", 51: "22.0", 31: "25.0"}
+      return xmltof[self.getfunctionvalue(1039)]
+      #return round(1.122462048 ** (self.getfunctionvalue(1039)-5), 1)
+
+    # subscribe to function value
+    def valuesubscribe(self, function, subscribe = "true"):
+      return self.ccsone.send('<function-value-request subscribe="%s" response-level="Always"><device><name>%s</name><function id="%s" /></device></function-value-request>'%(subscribe, self.num, function))
+
+    # get function value either from functions dict or directly from ccsone if unknown
+    def getfunctionvalue(self, function, subscribe = "true"):
+      if function in self.functions:
+        functionvalue = self.functions[function]
+      else:
+        self.valuesubscribe(function, subscribe)
+        timeout = self.ccsone.requesttimeout
+        while not function in self.functions:
+          time.sleep(0.05)
+          timeout - 0.05
+          if timeout <= 0:
+            return False
+        functionvalue = self.functions[function]
+      return functionvalue
+
+    # set function value
+    def setfunctionvalue(self, function, value):
+      self.ccsone.success = False
+      self.ccsone.send('<function-value-change response-level="Always"><device><name>%s</name><function id="%s"><value>%s</value></function></device></function-value-change>'%(self.num, function, value))
+      return self.ccsone.waitforsuccess()
+
+  # add a cam object by number to ccsone obj
+  def addcam(self, num):
+    try:
+      self.cams[int(num)] = (self.Cam(int(num), self))
+    except:
+      return False
+    return True
+
+  # get information about connected devices and subscribe
+  def getdeviceinformation(self):
+    return self.send('<device-information-request subscribe="true"/>')
+
+  # auth against ccsone
+  def auth(self, name):
+    self.send('<application-authentication-request xml-protocol="2.0" response-level="Always"><name>%s</name></application-authentication-request>'%name) 
+
+  # init socket and start recieve thread
+  def initsocket(self):
+    self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    self.socket.setblocking(0)
+    self.socket.settimeout(self.timeout)
+    try:
+      self.socket.connect((self.rip, self.rport))
+    except TimeoutError:
+      print("Connection Timeout")
+      return False
+    except:
+      print("Connection Error")
+      return False
+    self.connected = True
+    self.recvthread = Thread(target=self.recv)
+    self.recvthread.start()
+    return True
+
+  # close socket
+  def closesocket(self):
+    try:
+      self.socket.shutdown(socket.SHUT_WR)
+      self.socket.close()
+    except:
+      return False
+    self.connected = False
+    return True
+
+  # wait for positive response
+  def waitforsuccess(self):
+    timeout = self.requesttimeout
+    while not self.success:
+      time.sleep(0.01)
+      timeout - 0.01
+      if timeout <= 0:
+        return False
+    return True
+
+  # send data via socket
+  def send(self, data):
+    self.success = False
+    try:
+      self.socket.send(data.encode())
+    except:
+      return False
+    return self.waitforsuccess()
+
+  # add newly reported devices into devices dict
+  def updatedevicelist(self, device):
+    if not device['sessionid'] in self.devices:
+      self.devices[device['sessionid']] = self.Device(device['sessionid'], device['name'], device['type'], device['@connection-state'])
+    if device['type'] == "Camera" and not device['name']['#text'] in self.cams:
+      self.addcam(device['name']['#text'])
+
+  # handle various responses from ccsone
+  def handleresponse(self, data):
+    xml = xmltodict.parse(data)
+    for xmlroot in xml:
+      if xmlroot == "request-response":
+        if xml[xmlroot]['@result'] == "Ok":
+          self.success = True
+        else:
+          print("Error %s"%xml[xmlroot]['@result'])
+      elif xmlroot == "application-authentication-indication":
+        print("Auth indication Name: %s Location: %s"%(xml[xmlroot]['name'],xml[xmlroot]['location']))
+        self.name = xml[xmlroot]['name']
+        self.location = xml[xmlroot]['location']
+      elif xmlroot == "function-value-indication":
+        if type(xml[xmlroot]['device']) == list:
+          self.cams[int(xml[xmlroot]['device'][0]['name'])].functions[int(xml[xmlroot]['device'][0]['function']['@id'])] = int(xml[xmlroot]['device'][0]['function']['value'])
+        else:
+          self.cams[int(xml[xmlroot]['device']['name'])].functions[int(xml[xmlroot]['device']['function']['@id'])] = int(xml[xmlroot]['device']['function']['value'])
+      elif xmlroot == "device-information-indication":
+        if type(xml[xmlroot]['device']) == list:
+          for device in xml[xmlroot]['device']:
+            self.updatedevicelist(device)
+        else:
+            self.updatedevicelist(xml[xmlroot])
+
+  # recv function for recieve thread
+  def recv(self):
+    while self.connected:
+      self.socket.settimeout(None)
+      data = self.socket.recv(8192).decode()
+      if not data:
+        return
+      self.handleresponse(data)
+
+  def setupkeyhooks(self):
+    keyboard.on_press(self.handlekeypress)
+  
+  def handlekeypress(self, keydown):
+    if keydown.name == 'q':
+      self.close()
+    elif keydown.name in range(1,10):
+      self.cams[keydown.name].toggletally()