def buildMessage(msgtype, token, code, messageId, options=[], payload=[]):
assert msgtype in d.TYPE_ALL
assert code in d.METHOD_ALL + d.COAP_RC_ALL
message = []
# determine token length
TKL = None
for tokenLen in range(1, 8 + 1):
if token < (1 << (8 * tokenLen)):
TKL = tokenLen
break
if not TKL:
raise ValueError('token {0} too long'.format(token))
# header
message += [d.COAP_VERSION << 6 | msgtype << 4 | TKL]
message += [code]
message += u.int2buf(messageId, 2)
message += u.int2buf(token, TKL)
# options
options = sortOptions(options)
lastOptionNum = 0
for option in options:
assert option.optionNumber >= lastOptionNum
message += option.toBytes(lastOptionNum)
lastOptionNum = option.optionNumber
# payload
if payload:
message += [d.COAP_PAYLOAD_MARKER]
message += payload
return message
def buildMessage(msgtype,
token,
code,
messageId,
options=[],
payload=[],
securityContext=None,
partialIV=None):
assert msgtype in d.TYPE_ALL
assert code in d.METHOD_ALL + d.COAP_RC_ALL
message = []
TKL = 0
if token:
# determine token length
for tokenLen in range(1, 8 + 1):
if token < (1 << (8 * tokenLen)):
TKL = tokenLen
break
if not TKL:
raise ValueError('token {0} too long'.format(token))
# header
message += [d.COAP_VERSION << 6 | msgtype << 4 | TKL]
message += [code]
message += u.int2buf(messageId, 2)
message += u.int2buf(token, TKL)
# options
options = sortOptions(options)
if securityContext:
# invoke oscoap to protect the message
(outerOptions,
newPayload) = oscoap.protectMessage(context=securityContext,
version=d.COAP_VERSION,
code=code,
options=options,
payload=payload,
partialIV=partialIV)
else:
(outerOptions, newPayload) = (options, payload)
# add encoded options
message += encodeOptions(outerOptions)
# add payload
message += encodePayload(newPayload)
return message
def getRequestSecurityParams(objectSecurityOption):
if objectSecurityOption:
context = objectSecurityOption.context
newSequenceNumber = objectSecurityOption.context.getSequenceNumber()
# convert sequence number to string that is the length of the IV
newSequenceNumber = u.buf2str(u.int2buf(newSequenceNumber, context.aeadAlgorithm.ivLength))
return (context, newSequenceNumber)
else:
return (None, None)
def buildMessage(type, token, code, messageId, options=[], payload=[]):
assert type in d.TYPE_ALL
assert code in d.METHOD_ALL + d.COAP_RC_ALL
message = []
# determine token length
TKL = None
for tokenLen in range(1, 8 + 1):
if token < (1 << (8 * tokenLen)):
TKL = tokenLen
break
if not TKL:
raise ValueError("token {0} too long".format(token))
# header
message += [d.COAP_VERSION << 6 | type << 4 | TKL]
message += [code]
message += u.int2buf(messageId, 2)
message += u.int2buf(token, TKL)
# options
options = sortOptions(options)
lastOptionNum = 0
for option in options:
assert option.optionNumber >= lastOptionNum
message += option.toBytes(lastOptionNum)
lastOptionNum = option.optionNumber
# payload
if payload:
message += [d.COAP_PAYLOAD_MARKER]
message += payload
print "sent message {0}".format(",".join(str(c) for c in message))
return message
def toBytes(self, lastOptionNum):
payload = self.getPayloadBytes()
delta = self.optionNumber - lastOptionNum
# optionDelta and optionDeltaExt fields
if delta <= 12:
optionDelta = delta
optionDeltaExt = u.int2buf(delta, 0)
elif delta <= (0xff + 13):
optionDelta = 13
optionDeltaExt = u.int2buf(delta - 13, 1)
elif delta <= (0xffff + 269):
optionDelta = 14
optionDeltaExt = u.int2buf(delta - 269, 2)
else:
raise ValueError('delta is too large: {0}'.format(delta))
# optionLength and optionLengthExt fields
if len(payload) <= 12:
optionLength = len(payload)
optionLengthExt = u.int2buf(len(payload), 0)
elif len(payload) <= (0xff + 13):
optionLength = 13
optionLengthExt = u.int2buf(len(payload) - 13, 1)
elif len(payload) <= (0xffff + 269):
optionLength = 14
optionLengthExt = u.int2buf(len(payload) - 269, 2)
else:
raise ValueError('payload is too long, {0} bytes'.format(
len(payload)))
returnVal = []
returnVal += [optionDelta << 4 | optionLength]
returnVal += optionDeltaExt
returnVal += optionLengthExt
returnVal += payload
return returnVal
def toBytes(self,lastOptionNum):
payload = self.getPayloadBytes()
delta = self.optionNumber-lastOptionNum
# optionDelta and optionDeltaExt fields
if delta<=12:
optionDelta = delta
optionDeltaExt = u.int2buf( delta,0)
elif delta<=(0xff+13):
optionDelta = 13
optionDeltaExt = u.int2buf( delta-13,1)
elif delta<=(0xffff+269):
optionDelta = 14
optionDeltaExt = u.int2buf(delta-269,2)
else:
raise ValueError('delta is too large: {0}'.format(delta))
# optionLength and optionLengthExt fields
if len(payload)<=12:
optionLength = len(payload)
optionLengthExt = u.int2buf( len(payload),0)
elif len(payload)<=(0xff+13):
optionLength = 13
optionLengthExt = u.int2buf( len(payload)-13,1)
elif len(payload)<=(0xffff+269):
optionLength = 14
optionLengthExt = u.int2buf(len(payload)-269,2)
else:
raise ValueError('payload is too long, {0} bytes'.format(len(payload)))
returnVal = []
returnVal += [optionDelta<<4 | optionLength]
returnVal += optionDeltaExt
returnVal += optionLengthExt
returnVal += payload
return returnVal
