lambda_master_handler module

class lambda_master_handler.MasterHandler

docstring create a master handler project, create a logger as well as an mqtt manager for mqtt related task

param self:the instance of MasterHandler class

_expectedTopic = ''

the topic that the master handler is expecting to receive from, the _replyReceived flag is only set if the expected topic mateched the received topic

_logger = None

Instance of logger used for logging purpose

_mqttManager = None

Instance of an mqtt manager, used by the master handler for communicating with aws mqtt

_replyMessage = ''

message received by mqtt callback function

_replyReceived = False

flags used for signalling if the correct reply has been received by mqtt callback function

getApplicanceByMessage(message)

Parse the message sent by Alexa for the target endpoint ID and then look for that endpoint in the database list in the mqtt manager

param self:instance of master handler param message:the message received by lambda handler from Alexa

handleDiscoveryV3(request)

Used to handle discovery request, which lets Alexa know the list of devices that is available and what they can do

param self:the instance of master hander param request:the request received by the lambda handler

handleErrorResponse(request, errorType, errorMessage)

Used for creating a response to Amazon that indicates something wrong has happened

param self:instance of master handler param request:the request received by lambda handler param errorType:  type of error encountered, limited number of types supported param errorMessage:  error message to be included in the payload

handleNonDiscoveryV3(request, context)

Most requests are handled here, the handler will parse the necessary detail, forward it to the correct devices(using endpoint-ID to identify who to send to), wait for repy and then either timeout or tranlsate the reply of the IoT device into something that Alexa can understand and then hand it to the original lambda_handler in lambda_main

param self:instance of master handler param request:the request received by lambda handler param context:execution contex, not used

static subCallBack(client, userdata, message)

The mqtt subscribe callback function, used for receiving messages from the IoT devices

param client:derpecated param param userdata:deperated param param message:an object that contains the main payload as well as the topic that payload comes from