def _query(self, observeAction, observePath, tokenText=None):
'''Runs the reader's query.
Uses a randomly generated two byte token, or the provided string encoded
bytes.
:param observeAction: string -- reg (register), dereg (deregister);
triggers inclusion of Observe option
:param observePath: string Path for register/deregister
:param tokenText: string String encoding of token bytes; must by an
even-numbered length of characters like '05'
or '05a6'
'''
# create message
msg = CoapMessage(self._hostTuple)
msg.messageType = MessageType.NON
msg.codeClass = CodeClass.Request
msg.codeDetail = RequestCode.GET
msg.messageId = random.randint(0, 65535)
if observePath == 'core':
msg.addOption(CoapOption(OptionType.UriPath, '.well-known'))
msg.addOption(CoapOption(OptionType.UriPath, 'core'))
elif observePath == 'stats':
msg.addOption(CoapOption(OptionType.UriPath, 'cli'))
msg.addOption(CoapOption(OptionType.UriPath, 'stats'))
elif observePath == 'stats2':
msg.addOption(CoapOption(OptionType.UriPath, 'cli'))
msg.addOption(CoapOption(OptionType.UriPath, 'stats2'))
if observeAction == 'reg':
# register
msg.addOption(CoapOption(OptionType.Observe, 0))
if tokenText:
msg.tokenLength = len(tokenText) / 2
msg.token = bytearray(msg.tokenLength)
for i in range(0, msg.tokenLength):
msg.token[i] = int(tokenText[2 * i:2 * (i + 1)], base=16)
else:
msg.tokenLength = 2
msg.token = bytearray(2)
msg.token[0] = random.randint(0, 255)
msg.token[1] = random.randint(0, 255)
self._registeredPaths[observePath] = msg.token
elif observeAction == 'dereg':
# deregister
msg.addOption(CoapOption(OptionType.Observe, 1))
msg.tokenLength = 2
msg.token = self._registeredPaths[observePath]
# assume deregistration will succeed
del self._registeredPaths[observePath]
# send message
log.debug('Sending query')
self._client.send(msg)
def _sendNotifResponse(self, notif, responseType):
'''Sends an empty ACK or RST response to a notification
:param notif: CoapMessage Observe notification from server
'''
msg = CoapMessage(notif.address)
msg.codeClass = CodeClass.Empty
msg.codeDetail = ClientResponseCode.Empty
msg.messageId = notif.messageId
msg.tokenLength = 0
msg.token = None
if responseType == 'reset':
msg.messageType = MessageType.RST
else:
msg.messageType = MessageType.ACK
log.debug('Sending {0} for notification response'.format(responseType))
self._client.send(msg)
