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Chapter 4. Implementation 56

MainWindow: The MainWindow is the graphical framework in which the two previously men-

tioned classes are embedded. It contains a set of functions and minor classes for basic

functionality, such as graphical tools for manipulating the device database and logging.

These three parts are described later in more detail in separate sections.

visualization

protocol output

protocol input

switch

receiver/

sender

device changed

database changed

device changed ns

switch sender

get scene list

get

members

member names

all member names

scene changed

service publishersubscriber

get device

Figure 4.17.: The visualization node with its ROS interfaces.

The visualization node is connected via several topics to the device manager. The "device changed"

and "database changed" topics ensure that all displayed information is updated instantly. It also

ensures the internal copy of the database is synchronized. The "switch sender"-publisher allows the

control of HA devices through the device manager node. Besides those topics, the visualization

node also uses the "add/remove/change sender/receiver" and "get device list" services. The

"protocol input/output"-topics from the gateway driver are used by the MainWindow to add new

transmitters to the database. Although this violates the clear separations of the layer model (see

ﬁgure 3.2 on page 28), it would not be possible otherwise. The visualization node oﬀers several

topics and services for subsequent nodes, which are all part of the namespace service and therefore

belong to the scene menu class. These services are:

Get scene list: Returns a list of all namespaces.

Get members: Returns a list of full device structures of all devices within a speciﬁc namespace.

Get member names: Same as "get members"-service, but will return only the names of the

devices, instead of their full structures. This service is suitable for nodes that do not need

the additional data to reduce the overall data traﬃc.

Get all member names: Returns a list of names with namespaces of all devices that are used in

the scene database. For example, if there are the two scenes "scene1" and "scene2", of which

each one contains two devices, the service will return: "scene1/device1", "scene1/device2",

"scene2/device3" and "scene2/device4".

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RFXCOM RFXtrx433 Especificaciones Pagina 63