![]() A Network image consists of a lot of details, points, and joints. A Network diagram can show even the complex network arrangements through mapping and graphing, making it easier to understand people. ![]() Components like routers, devices, sources, computers, receivers, firewalls, hubs, and databases together unite to make a successful network. All components of a network can be shown in these diagrams depending on their type, size, and purpose. That virtual or physical image is known as network diagram. When you use signals, you can use their name directly as state transition trigger/event.Any network related to this digital world can be represented through a virtual or physical image. If you want to formally define a protocol in UML, you'd need to create as well a protocol state machine that tells the valid succession of messages. Last but not least, keep in mind that the sequence diagram represents just a specific scenario. For instance, I still don't know according to your diagram, if setVelocity is supposed to directly send something to the car, or if its a preparatory step for sending the movement message with a velocity. The reader has then difficulty to see what's really required by the protocol, and what's the implementation details. If you try to put the protocol and its implementation in the same diagram, as in your second diagram, it gets confusing because of the lack of separation of concerns: here you say the computer is calling a send function on the car, which is not at all what you want. I do not provide examples because it would very much look like your current diagram, but the send functions would probably be implemented by a communication controller. There are certainly several classes involved on the side of the computer (one diagram, the final action being some kind of sending) and on the side of the car (another diagram: how to receive and dispatch the message, and decode its content). The implementation details could then be shown in a separate diagram. ![]() Signal allows to show the high level view of the protocol exchanges, without getting lost on the practical implementation details: In your sequence diagram, you'd then send and arrow with Movement (X,100,0). So in a class diagram, you could document the «signal»Movement as having attributes id, velocity and direction: My position about the use of signals is unchanged: signals would correspond to the information exchanged between the computer and the car. With the diagrams, your edited question is much clearer. If you prefer communication diagram over interaction diagrams, the signal approach would be clearer, since communication diagrams don't show return messages. ![]() It's semantic is more suitable for your needs. But signals are meant for asynchronous communication and better reflect imho the nature of the communication. In both cases, you would show the interactions of your communication protocol with an almost identical sequence diagram. The classes that are able to receive the signals show it as reception (looks like an operation, but again with «signal» keyword). In a class diagram, they are represented like a class but with the «signal» keyword: velocity and direction would be attributes of that signal. The return message could just be label as ACK.Ī «signal» Movement: Signals correspond to event messages. You would typically show the exchange in a sequence diagram, with a call arrow from the sender to the receiver. There are two main ways of representing the sending of a movement message between two devices:Ī movement() operation on the target device, with parameters for the velocity and direction. (or am I wrong?) And the same things for ACK. sendBluetoothMessage() is actually a function of Computer.The followings of setVelocity() are actually what happens inside that. It seems like Computer first triggered the setVelocity() funciton and then sendBluetoothMessage() sequentially which are not sequential.Normally this is what my diagram looks like without protocol details:īut when I tried to add messages, there are at least 2 problems: with message id "Movement" and sequence number X.which is acknowledged by RC car by sending ACK message.with velocity field is set to 100 and direction field is set to 0."Computer" triggers "setVelocity()" function of "RC car".Īt this point, I want to refine the communication by saying that Currently in the diagrams the flow is something like: For Example, I have a computer and a RC robot where they talk via Bluetooth. In my UML model I have a system and its subcomponents that talk to each other.
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