class QCoapMessage¶

The QCoapMessage class holds information about a CoAP message that can be a request or a reply. More…

Inherited by: QCoapRequest

Synopsis¶

Methods¶

def __init__()
def addOption()
def clearOptions()
def hasOption()
def messageId()
def option()
def optionAt()
def optionCount()
def options()
def payload()
def removeOption()
def setMessageId()
def setOptions()
def setPayload()
def setToken()
def setType()
def setVersion()
def swap()
def token()
def tokenLength()
def type()
def version()

Note

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Detailed Description¶

It holds information such as the message type, message id, token and other ancillary data.

See also

QCoapOption QCoapReply QCoapRequest

class Type¶

Indicates the type of the message.

Constant

Description

QCoapMessage.Type.Confirmable

A Confirmable message. The destination endpoint needs to acknowledge the message.

QCoapMessage.Type.NonConfirmable

A Non-Confirmable message. The destination endpoint does not need to acknowledge the message.

QCoapMessage.Type.Acknowledgment

An Acknowledgment message. A message sent or received in reply to a Confirmable message.

QCoapMessage.Type.Reset

A Reset message. This message type is used in case of errors or to stop the ongoing transmission. (For example, it is used to cancel an observation).

Constant	Description
QCoapMessage.Type.Confirmable	A Confirmable message. The destination endpoint needs to acknowledge the message.
QCoapMessage.Type.NonConfirmable	A Non-Confirmable message. The destination endpoint does not need to acknowledge the message.
QCoapMessage.Type.Acknowledgment	An Acknowledgment message. A message sent or received in reply to a Confirmable message.
QCoapMessage.Type.Reset	A Reset message. This message type is used in case of errors or to stop the ongoing transmission. (For example, it is used to cancel an observation).

__init__()¶

Constructs a new QCoapMessage .

__init__(other)

Parameters:: other – QCoapMessage

Constructs a shallow copy of other.

addOption(option)¶

Parameters:: option – QCoapOption

Adds the given CoAP option.

addOption(name[, value=QByteArray()])

Parameters:

name – OptionName
value – QByteArray

This is an overloaded function.

Adds the CoAP option with the given name and value.

clearOptions()¶

Removes all options.

hasOption(name)¶

Parameters:: name – OptionName
Return type:: bool

Returns true if the message contains at last one option with name.

messageId()¶

Return type:: int

Returns the message id.

See also

setMessageId()

option(name)¶

Parameters:: name – OptionName
Return type:: QCoapOption

Finds and returns the first option with the given name. If there is no such option, returns an invalid QCoapOption with an empty value.

optionAt(index)¶

Parameters:: index – int
Return type:: QCoapOption

Returns the option at index position.

optionCount()¶

Return type:: int

Returns the number of options.

options()¶

Return type:: .list of QCoapOption

Returns the list of options.

See also

setOptions()

options(name)

Parameters:: name – OptionName
Return type:: .list of QCoapOption

Finds and returns the list of options with the given name.

payload()¶

Return type:: QByteArray

Returns the payload.

See also

setPayload()

removeOption(name)¶

Parameters:: name – OptionName

Removes all options with the given name. The CoAP protocol allows for the same option to repeat.

removeOption(option)

Parameters:: option – QCoapOption

Removes the given option.

setMessageId(arg__1)¶

Parameters:: arg__1 – int

Sets the message ID to id.

See also

messageId()

setOptions(options)¶

Parameters:: options – .list of QCoapOption

Sets the message options to options.

See also

options()

setPayload(payload)¶

Parameters:: payload – QByteArray

Sets the message payload to payload. The payload can be represented in one of the content formats defined in CoAP Content-Formats Registry .

Note

CoAP supports common content formats such as XML, JSON, and so on, but these are text based and consequently heavy both in payload and in processing. One of the recommended content formats to use with CoAP is CBOR, which is designed to be used in such contexts.