# Server/Simulator

WORK IN PROGRESS, do NOT use

The simulator is a full fledged modbus server/simulator.

The purpose of the simulator is to provide support for client application test harnesses with end-to-end testing simulating real life modbus devices.

The simulator allows the user to (all automated):

- simulate a modbus device by adding a simple configuration,

- simulate a multipoint line, but adding multiple device configurations,

- simulate devices that are not conforming to the protocol,

- simulate communication problems (data loss etc),

- test how a client handles modbus response and exceptions,

- test a client apps correct use of the simulated device.

The web interface (activated optionally) allows the user to:

- introduce modbus errors (like e.g. wrong length),

- introduce communication errors (like splitting a message),

- monitor requests/responses,

- see/Change values online.

- inject modbus errors like malicious a response,

- run your test server in the cloud,

The REST API allow the test process to be automated

- spin up a test server in your test harness,

- set expected responses with a simple REST API command,

- check the result with a simple REST API command,

- test your client app in a true end-to-end fashion.

The web server uses the REST API internally, which helps to ensure that it actually works.