Diff: mbed-mqtt-master/paho_mqtt_embedded_c/test/MQTTV3112.py

Revision:

0:ba7e439238ab

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-mqtt-master/paho_mqtt_embedded_c/test/MQTTV3112.py	Mon Jun 20 16:24:43 2022 +0000
@@ -0,0 +1,923 @@
+"""
+*******************************************************************
+  Copyright (c) 2013, 2014 IBM Corp.
+ 
+  All rights reserved. This program and the accompanying materials
+  are made available under the terms of the Eclipse Public License v1.0
+  and Eclipse Distribution License v1.0 which accompany this distribution. 
+ 
+  The Eclipse Public License is available at 
+     http://www.eclipse.org/legal/epl-v10.html
+  and the Eclipse Distribution License is available at 
+    http://www.eclipse.org/org/documents/edl-v10.php.
+ 
+  Contributors:
+     Ian Craggs - initial implementation and/or documentation
+*******************************************************************
+"""
+from __future__ import print_function
+
+"""
+
+Assertions are used to validate incoming data, but are omitted from outgoing packets.  This is
+so that the tests that use this package can send invalid data for error testing.
+
+"""
+
+
+import logging
+
+logger = logging.getLogger("mqttsas")
+
+# Low-level protocol interface
+
+class MQTTException(Exception):
+  pass
+   
+
+# Message types
+CONNECT, CONNACK, PUBLISH, PUBACK, PUBREC, PUBREL, \
+PUBCOMP, SUBSCRIBE, SUBACK, UNSUBSCRIBE, UNSUBACK, \
+PINGREQ, PINGRESP, DISCONNECT = range(1, 15)
+
+packetNames = [ "reserved", \
+"Connect", "Connack", "Publish", "Puback", "Pubrec", "Pubrel", \
+"Pubcomp", "Subscribe", "Suback", "Unsubscribe", "Unsuback", \
+"Pingreq", "Pingresp", "Disconnect"]
+
+classNames = [ "reserved", \
+"Connects", "Connacks", "Publishes", "Pubacks", "Pubrecs", "Pubrels", \
+"Pubcomps", "Subscribes", "Subacks", "Unsubscribes", "Unsubacks", \
+"Pingreqs", "Pingresps", "Disconnects"]
+
+
+def MessageType(byte):
+  if byte != None:
+    rc = ord(byte[0]) >> 4
+  else:
+    rc = None
+  return rc
+
+
+def getPacket(aSocket):
+  "receive the next packet"
+  buf = aSocket.recv(1) # get the first byte fixed header
+  if buf == b"":
+    return None
+  if str(aSocket).find("[closed]") != -1:
+    closed = True
+  else:
+    closed = False
+  if closed:
+    return None
+  # now get the remaining length
+  multiplier = 1
+  remlength = 0
+  while 1:
+    next = aSocket.recv(1)
+    while len(next) == 0:
+      next = aSocket.recv(1)
+    buf += next
+    digit = ord(buf[-1])
+    remlength += (digit & 127) * multiplier
+    if digit & 128 == 0:
+      break
+    multiplier *= 128
+  # receive the remaining length if there is any
+  rest = ''
+  if remlength > 0:
+    while len(rest) < remlength:
+      rest += aSocket.recv(remlength-len(rest))
+  assert len(rest) == remlength
+  return buf + rest
+
+
+class FixedHeaders:
+
+  def __init__(self, aMessageType):
+    self.MessageType = aMessageType
+    self.DUP = False
+    self.QoS = 0
+    self.RETAIN = False
+    self.remainingLength = 0
+
+  def __eq__(self, fh):
+    return self.MessageType == fh.MessageType and \
+           self.DUP == fh.DUP and \
+           self.QoS == fh.QoS and \
+           self.RETAIN == fh.RETAIN # and \
+           # self.remainingLength == fh.remainingLength
+
+  def __repr__(self):
+    "return printable representation of our data"
+    return classNames[self.MessageType]+'(DUP='+repr(self.DUP)+ \
+           ", QoS="+repr(self.QoS)+", Retain="+repr(self.RETAIN)
+
+  def pack(self, length):
+    "pack data into string buffer ready for transmission down socket"
+    buffer = bytes([(self.MessageType << 4) | (self.DUP << 3) |\
+                         (self.QoS << 1) | self.RETAIN])
+    self.remainingLength = length
+    buffer += self.encode(length)
+    return buffer
+
+  def encode(self, x):
+    assert 0 <= x <= 268435455
+    buffer = b''
+    while 1:
+      digit = x % 128
+      x //= 128
+      if x > 0:
+        digit |= 0x80
+      buffer += bytes([digit])
+      if x == 0:
+        break
+    return buffer
+
+  def unpack(self, buffer):
+    "unpack data from string buffer into separate fields"
+    b0 = ord(buffer[0])
+    self.MessageType = b0 >> 4
+    self.DUP = ((b0 >> 3) & 0x01) == 1
+    self.QoS = (b0 >> 1) & 0x03
+    self.RETAIN = (b0 & 0x01) == 1
+    (self.remainingLength, bytes) = self.decode(buffer[1:])
+    return bytes + 1 # length of fixed header
+
+  def decode(self, buffer):
+    multiplier = 1
+    value = 0
+    bytes = 0
+    while 1:
+      bytes += 1
+      digit = ord(buffer[0])
+      buffer = buffer[1:]
+      value += (digit & 127) * multiplier
+      if digit & 128 == 0:
+        break
+      multiplier *= 128
+    return (value, bytes)
+
+
+def writeInt16(length):
+  return bytes([length // 256, length % 256])
+
+def readInt16(buf):
+  return ord(buf[0])*256 + ord(buf[1])
+
+def writeUTF(data):
+  # data could be a string, or bytes.  If string, encode into bytes with utf-8
+  return writeInt16(len(data)) + (data if type(data) == type(b"") else bytes(data, "utf-8"))
+
+def readUTF(buffer, maxlen):
+  if maxlen >= 2:
+    length = readInt16(buffer)
+  else:
+    raise MQTTException("Not enough data to read string length")
+  maxlen -= 2
+  if length > maxlen:
+    raise MQTTException("Length delimited string too long")
+  buf = buffer[2:2+length].decode("utf-8")
+  logger.info("[MQTT-4.7.3-2] topic names and filters not include null")
+  zz = buf.find("\x00") # look for null in the UTF string
+  if zz != -1:
+    raise MQTTException("[MQTT-1.5.3-2] Null found in UTF data "+buf)
+  """for c in range (0xD800, 0xDFFF):
+    zz = buf.find(chr(c)) # look for D800-DFFF in the UTF string
+    if zz != -1:
+      raise MQTTException("[MQTT-1.5.3-1] D800-DFFF found in UTF data "+buf)
+  """
+  if buf.find("\uFEFF") != -1:
+    logger.info("[MQTT-1.5.3-3] U+FEFF in UTF string") 
+  return buf
+
+def writeBytes(buffer):
+  return writeInt16(len(buffer)) + buffer
+
+def readBytes(buffer):
+  length = readInt16(buffer)
+  return buffer[2:2+length]
+
+
+class Packets:
+
+  def pack(self):
+    buffer = self.fh.pack(0)
+    return buffer
+
+  def __repr__(self):
+    return repr(self.fh)
+
+  def __eq__(self, packet):
+    return self.fh == packet.fh if packet else False
+
+
+class Connects(Packets):
+
+  def __init__(self, buffer = None):
+    self.fh = FixedHeaders(CONNECT)
+
+    # variable header
+    self.ProtocolName = "MQTT"
+    self.ProtocolVersion = 4
+    self.CleanSession = True
+    self.WillFlag = False
+    self.WillQoS = 0
+    self.WillRETAIN = 0
+    self.KeepAliveTimer = 30
+    self.usernameFlag = False
+    self.passwordFlag = False
+
+    # Payload
+    self.ClientIdentifier = ""   # UTF-8
+    self.WillTopic = None        # UTF-8
+    self.WillMessage = None      # binary
+    self.username = None         # UTF-8
+    self.password = None         # binary
+
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):    
+    connectFlags = bytes([(self.CleanSession << 1) | (self.WillFlag << 2) | \
+                       (self.WillQoS << 3) | (self.WillRETAIN << 5) | \
+                       (self.usernameFlag << 6) | (self.passwordFlag << 7)])
+    buffer = writeUTF(self.ProtocolName) + bytes([self.ProtocolVersion]) + \
+              connectFlags + writeInt16(self.KeepAliveTimer)
+    buffer += writeUTF(self.ClientIdentifier) 
+    if self.WillFlag:
+      buffer += writeUTF(self.WillTopic) 
+      buffer += writeBytes(self.WillMessage) 
+    if self.usernameFlag:
+      buffer += writeUTF(self.username) 
+    if self.passwordFlag:
+      buffer += writeBytes(self.password) 
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == CONNECT
+
+    try:
+      fhlen = self.fh.unpack(buffer)
+      packlen = fhlen + self.fh.remainingLength
+      assert len(buffer) >= packlen, "buffer length %d packet length %d" % (len(buffer), packlen)
+      curlen = fhlen # points to after header + remaining length
+      assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+      assert self.fh.QoS == 0, "[MQTT-2.1.2-1] QoS was not 0, was %d" % self.fh.QoS
+      assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+
+      self.ProtocolName = readUTF(buffer[curlen:], packlen - curlen)
+      curlen += len(self.ProtocolName) + 2
+      assert self.ProtocolName == "MQTT", "Wrong protocol name %s" % self.ProtocolName
+
+      self.ProtocolVersion = ord(buffer[curlen])
+      curlen += 1
+
+      connectFlags = ord(buffer[curlen])
+      assert (connectFlags & 0x01) == 0, "[MQTT-3.1.2-3] reserved connect flag must be 0"
+      self.CleanSession = ((connectFlags >> 1) & 0x01) == 1
+      self.WillFlag = ((connectFlags >> 2) & 0x01) == 1
+      self.WillQoS = (connectFlags >> 3) & 0x03
+      self.WillRETAIN = (connectFlags >> 5) & 0x01
+      self.passwordFlag = ((connectFlags >> 6) & 0x01) == 1
+      self.usernameFlag = ((connectFlags >> 7) & 0x01) == 1
+      curlen +=1
+
+      if self.WillFlag:
+        assert self.WillQoS in [0, 1, 2], "[MQTT-3.1.2-14] will qos must not be 3"
+      else:
+        assert self.WillQoS == 0, "[MQTT-3.1.2-13] will qos must be 0, if will flag is false"
+        assert self.WillRETAIN == False, "[MQTT-3.1.2-14] will retain must be false, if will flag is false"
+
+      self.KeepAliveTimer = readInt16(buffer[curlen:])
+      curlen += 2
+      logger.info("[MQTT-3.1.3-3] Clientid must be present, and first field")
+      logger.info("[MQTT-3.1.3-4] Clientid must be Unicode, and between 0 and 65535 bytes long")
+      self.ClientIdentifier = readUTF(buffer[curlen:], packlen - curlen)
+      curlen += len(self.ClientIdentifier) + 2
+
+      if self.WillFlag:
+        self.WillTopic = readUTF(buffer[curlen:], packlen - curlen)
+        curlen += len(self.WillTopic) + 2
+        self.WillMessage = readBytes(buffer[curlen:])
+        curlen += len(self.WillMessage) + 2
+        logger.info("[[MQTT-3.1.2-9] will topic and will message fields must be present")
+      else:
+        self.WillTopic = self.WillMessage = None
+
+      if self.usernameFlag:
+        assert len(buffer) > curlen+2, "Buffer too short to read username length"
+        self.username = readUTF(buffer[curlen:], packlen - curlen)
+        curlen += len(self.username) + 2
+        logger.info("[MQTT-3.1.2-19] username must be in payload if user name flag is 1")
+      else:
+        logger.info("[MQTT-3.1.2-18] username must not be in payload if user name flag is 0")
+        assert self.passwordFlag == False, "[MQTT-3.1.2-22] password flag must be 0 if username flag is 0"
+
+      if self.passwordFlag:
+        assert len(buffer) > curlen+2, "Buffer too short to read password length"
+        self.password = readBytes(buffer[curlen:])
+        curlen += len(self.password) + 2
+        logger.info("[MQTT-3.1.2-21] password must be in payload if password flag is 0")
+      else:
+        logger.info("[MQTT-3.1.2-20] password must not be in payload if password flag is 0")
+
+      if self.WillFlag and self.usernameFlag and self.passwordFlag:
+        logger.info("[MQTT-3.1.3-1] clientid, will topic, will message, username and password all present")
+
+      assert curlen == packlen, "Packet is wrong length curlen %d != packlen %d"
+    except:
+      logger.exception("[MQTT-3.1.4-1] server must validate connect packet and close connection without connack if it does not conform")
+      raise
+
+
+
+  def __repr__(self):
+    buf = repr(self.fh)+", ProtocolName="+str(self.ProtocolName)+", ProtocolVersion=" +\
+          repr(self.ProtocolVersion)+", CleanSession="+repr(self.CleanSession) +\
+          ", WillFlag="+repr(self.WillFlag)+", KeepAliveTimer=" +\
+          repr(self.KeepAliveTimer)+", ClientId="+str(self.ClientIdentifier) +\
+          ", usernameFlag="+repr(self.usernameFlag)+", passwordFlag="+repr(self.passwordFlag)
+    if self.WillFlag:
+      buf += ", WillQoS=" + repr(self.WillQoS) +\
+             ", WillRETAIN=" + repr(self.WillRETAIN) +\
+             ", WillTopic='"+ self.WillTopic +\
+             "', WillMessage='"+str(self.WillMessage)+"'"
+    if self.username:
+      buf += ", username="+self.username
+    if self.password:
+      buf += ", password="+str(self.password)
+    return buf+")"
+
+  def __eq__(self, packet):
+    rc = Packets.__eq__(self, packet) and \
+           self.ProtocolName == packet.ProtocolName and \
+           self.ProtocolVersion == packet.ProtocolVersion and \
+           self.CleanSession == packet.CleanSession and \
+           self.WillFlag == packet.WillFlag and \
+           self.KeepAliveTimer == packet.KeepAliveTimer and \
+           self.ClientIdentifier == packet.ClientIdentifier and \
+           self.WillFlag == packet.WillFlag
+    if rc and self.WillFlag:
+      rc = self.WillQoS == packet.WillQoS and \
+           self.WillRETAIN == packet.WillRETAIN and \
+           self.WillTopic == packet.WillTopic and \
+           self.WillMessage == packet.WillMessage
+    return rc
+
+
+class Connacks(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, ReturnCode=0):
+    self.fh = FixedHeaders(CONNACK)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    self.flags = 0
+    self.returnCode = ReturnCode
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = bytes([self.flags, self.returnCode])
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 4
+    assert MessageType(buffer) == CONNACK
+    self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 2, "Connack packet is wrong length %d" % self.fh.remainingLength
+    assert ord(buffer[2]) in  [0, 1], "Connect Acknowledge Flags"
+    self.returnCode = ord(buffer[3])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+
+  def __repr__(self):
+    return repr(self.fh)+", Session present="+str((self.flags & 0x01) == 1)+", ReturnCode="+repr(self.returnCode)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.returnCode == packet.returnCode
+
+
+class Disconnects(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False):
+    self.fh = FixedHeaders(DISCONNECT)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    if buffer != None:
+      self.unpack(buffer)
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == DISCONNECT
+    self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 0, "Disconnect packet is wrong length %d" % self.fh.remainingLength
+    logger.info("[MQTT-3.14.1-1] disconnect reserved bits must be 0")
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+
+  def __repr__(self):
+    return repr(self.fh)+")"
+
+
+class Publishes(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0, TopicName="", Payload=b""):
+    self.fh = FixedHeaders(PUBLISH)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.topicName = TopicName
+    self.messageIdentifier = MsgId
+    # payload
+    self.data = Payload
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeUTF(self.topicName)
+    if self.fh.QoS != 0:
+      buffer +=  writeInt16(self.messageIdentifier)
+    buffer += self.data
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PUBLISH
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.QoS in [0, 1, 2], "QoS in Publish must be 0, 1, or 2"
+    packlen = fhlen + self.fh.remainingLength
+    assert len(buffer) >= packlen
+    curlen = fhlen
+    try:
+      self.topicName = readUTF(buffer[fhlen:], packlen - curlen)
+    except UnicodeDecodeError:
+      logger.info("[MQTT-3.3.2-1] topic name in publish must be utf-8")
+      raise
+    curlen += len(self.topicName) + 2
+    if self.fh.QoS != 0:
+      self.messageIdentifier = readInt16(buffer[curlen:])
+      logger.info("[MQTT-2.3.1-1] packet indentifier must be in publish if QoS is 1 or 2")
+      curlen += 2
+      assert self.messageIdentifier > 0, "[MQTT-2.3.1-1] packet indentifier must be > 0"
+    else:
+      logger.info("[MQTT-2.3.1-5] no packet indentifier in publish if QoS is 0")
+      self.messageIdentifier = 0
+    self.data = buffer[curlen:fhlen + self.fh.remainingLength]
+    if self.fh.QoS == 0:
+      assert self.fh.DUP == False, "[MQTT-2.1.2-4]"
+    return fhlen + self.fh.remainingLength
+
+  def __repr__(self):
+    rc = repr(self.fh)
+    if self.fh.QoS != 0:
+      rc += ", MsgId="+repr(self.messageIdentifier)
+    rc += ", TopicName="+repr(self.topicName)+", Payload="+repr(self.data)+")"
+    return rc
+
+  def __eq__(self, packet):
+    rc = Packets.__eq__(self, packet) and \
+         self.topicName == packet.topicName and \
+         self.data == packet.data
+    if rc and self.fh.QoS != 0:
+      rc = self.messageIdentifier == packet.messageIdentifier
+    return rc
+
+
+class Pubacks(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0):
+    self.fh = FixedHeaders(PUBACK)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PUBACK
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 2, "Puback packet is wrong length %d" % self.fh.remainingLength
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] Puback reserved bits must be 0"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1] Puback reserved bits must be 0"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] Puback reserved bits must be 0"
+    return fhlen + 2
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId "+repr(self.messageIdentifier)
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier
+
+
+class Pubrecs(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0):
+    self.fh = FixedHeaders(PUBREC)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PUBREC
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 2, "Pubrec packet is wrong length %d" % self.fh.remainingLength
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] Pubrec reserved bits must be 0"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1] Pubrec reserved bits must be 0"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] Pubrec reserved bits must be 0"
+    return fhlen + 2
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier
+
+
+class Pubrels(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=1, Retain=False, MsgId=0):
+    self.fh = FixedHeaders(PUBREL)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PUBREL
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 2, "Pubrel packet is wrong length %d" % self.fh.remainingLength
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] DUP should be False in PUBREL"
+    assert self.fh.QoS == 1, "[MQTT-2.1.2-1] QoS should be 1 in PUBREL"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] RETAIN should be False in PUBREL"
+    logger.info("[MQTT-3.6.1-1] bits in fixed header for pubrel are ok")
+    return fhlen + 2
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier
+
+
+class Pubcomps(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0):
+    self.fh = FixedHeaders(PUBCOMP)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PUBCOMP
+    fhlen = self.fh.unpack(buffer)
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    assert self.fh.remainingLength == 2, "Pubcomp packet is wrong length %d" % self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] DUP should be False in Pubcomp"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1] QoS should be 0 in Pubcomp"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] Retain should be false in Pubcomp"
+    return fhlen + 2
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier
+
+
+class Subscribes(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=1, Retain=False, MsgId=0, Data=[]):
+    self.fh = FixedHeaders(SUBSCRIBE)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    # payload - list of topic, qos pairs
+    self.data = Data[:]
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    for d in self.data:
+      buffer += writeUTF(d[0]) + bytes([d[1]])
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == SUBSCRIBE
+    fhlen = self.fh.unpack(buffer)
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    logger.info("[MQTT-2.3.1-1] packet indentifier must be in subscribe")
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.messageIdentifier > 0, "[MQTT-2.3.1-1] packet indentifier must be > 0"
+    leftlen = self.fh.remainingLength - 2
+    self.data = []
+    while leftlen > 0:
+      topic = readUTF(buffer[-leftlen:], leftlen)
+      leftlen -= len(topic) + 2
+      qos = ord(buffer[-leftlen])
+      assert qos in [0, 1, 2], "[MQTT-3-8.3-2] reserved bits must be zero"
+      leftlen -= 1
+      self.data.append((topic, qos))
+    assert len(self.data) > 0, "[MQTT-3.8.3-1] at least one topic, qos pair must be in subscribe"
+    assert leftlen == 0
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] DUP must be false in subscribe"
+    assert self.fh.QoS == 1, "[MQTT-2.1.2-1] QoS must be 1 in subscribe"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] RETAIN must be false in subscribe"
+    return fhlen + self.fh.remainingLength
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+\
+           ", Data="+repr(self.data)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier and \
+           self.data == packet.data
+
+
+class Subacks(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0, Data=[]):
+    self.fh = FixedHeaders(SUBACK)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    # payload - list of qos
+    self.data = Data[:]
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    for d in self.data:
+      buffer += bytes([d])
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == SUBACK
+    fhlen = self.fh.unpack(buffer)
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    leftlen = self.fh.remainingLength - 2
+    self.data = []
+    while leftlen > 0:
+      qos = buffer[-leftlen]
+      assert ord(qos) in [0, 1, 2, 0x80], "[MQTT-3.9.3-2] return code in QoS must be 0, 1, 2 or 0x80, was "+ord(qos)
+      leftlen -= 1
+      self.data.append(qos)
+    assert leftlen == 0
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1] DUP should be false in suback"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1] QoS should be 0 in suback"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1] Retain should be false in suback"
+    return fhlen + self.fh.remainingLength
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+\
+           ", Data="+repr(self.data)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier and \
+           self.data == packet.data
+
+
+class Unsubscribes(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=1, Retain=False, MsgId=0, Data=[]):
+    self.fh = FixedHeaders(UNSUBSCRIBE)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    # payload - list of topics
+    self.data = Data[:]
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    for d in self.data:
+      buffer += writeUTF(d)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == UNSUBSCRIBE
+    fhlen = self.fh.unpack(buffer)
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    logger.info("[MQTT-2.3.1-1] packet indentifier must be in unsubscribe")
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.messageIdentifier > 0, "[MQTT-2.3.1-1] packet indentifier must be > 0"
+    leftlen = self.fh.remainingLength - 2
+    self.data = []
+    while leftlen > 0:
+      topic = readUTF(buffer[-leftlen:], leftlen)
+      leftlen -= len(topic) + 2
+      self.data.append(topic)
+    assert leftlen == 0
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 1, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+    logger.info("[MQTT-3-10.1-1] fixed header bits are 0,0,1,0")
+    return fhlen + self.fh.remainingLength
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+\
+           ", Data="+repr(self.data)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier and \
+           self.data == packet.data
+
+
+class Unsubacks(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False, MsgId=0):
+    self.fh = FixedHeaders(UNSUBACK)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    # variable header
+    self.messageIdentifier = MsgId
+    if buffer != None:
+      self.unpack(buffer)
+
+  def pack(self):
+    buffer = writeInt16(self.messageIdentifier)
+    buffer = self.fh.pack(len(buffer)) + buffer
+    return buffer
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == UNSUBACK
+    fhlen = self.fh.unpack(buffer)
+    assert len(buffer) >= fhlen + self.fh.remainingLength
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.messageIdentifier > 0, "[MQTT-2.3.1-1] packet indentifier must be > 0"
+    self.messageIdentifier = readInt16(buffer[fhlen:])
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+    return fhlen + self.fh.remainingLength
+
+  def __repr__(self):
+    return repr(self.fh)+", MsgId="+repr(self.messageIdentifier)+")"
+
+  def __eq__(self, packet):
+    return Packets.__eq__(self, packet) and \
+           self.messageIdentifier == packet.messageIdentifier
+
+
+class Pingreqs(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False):
+    self.fh = FixedHeaders(PINGREQ)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    if buffer != None:
+      self.unpack(buffer)
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PINGREQ
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 0
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+    return fhlen
+
+  def __repr__(self):
+    return repr(self.fh)+")"
+
+
+class Pingresps(Packets):
+
+  def __init__(self, buffer=None, DUP=False, QoS=0, Retain=False):
+    self.fh = FixedHeaders(PINGRESP)
+    self.fh.DUP = DUP
+    self.fh.QoS = QoS
+    self.fh.Retain = Retain
+    if buffer != None:
+      self.unpack(buffer)
+
+  def unpack(self, buffer):
+    assert len(buffer) >= 2
+    assert MessageType(buffer) == PINGRESP
+    fhlen = self.fh.unpack(buffer)
+    assert self.fh.remainingLength == 0
+    assert self.fh.DUP == False, "[MQTT-2.1.2-1]"
+    assert self.fh.QoS == 0, "[MQTT-2.1.2-1]"
+    assert self.fh.RETAIN == False, "[MQTT-2.1.2-1]"
+    return fhlen
+
+  def __repr__(self):
+    return repr(self.fh)+")"
+
+classes = [None, Connects, Connacks, Publishes, Pubacks, Pubrecs,
+           Pubrels, Pubcomps, Subscribes, Subacks, Unsubscribes,
+           Unsubacks, Pingreqs, Pingresps, Disconnects]
+
+def unpackPacket(buffer):
+  if MessageType(buffer) != None:
+    packet = classes[MessageType(buffer)]()
+    packet.unpack(buffer)
+  else:
+    packet = None
+  return packet
+
+if __name__ == "__main__":
+  fh = FixedHeaders(CONNECT)
+  tests = [0, 56, 127, 128, 8888, 16383, 16384, 65535, 2097151, 2097152,
+           20555666, 268435454, 268435455]
+  for x in tests:
+    try:
+      assert x == fh.decode(fh.encode(x))[0]
+    except AssertionError:
+      print("Test failed for x =", x, fh.decode(fh.encode(x)))
+  try:
+    fh.decode(fh.encode(268435456))
+    print("Error")
+  except AssertionError:
+    pass
+
+  for packet in classes[1:]:
+    before = str(packet())   
+    after = str(unpackPacket(packet().pack()))
+    try:
+      assert before == after
+    except:
+      print("before:", before, "\nafter:", after)
+  print("End")
+