# Connect to Prosys Simulation Server

Developed by Prosys, the Prosys Simulation Server is a sophisticated OPC UA server that serves to replicate the behaviors of OPC UA devices and systems. 

To establish a seamless connection with the Prosys Simulation Server using EMQX Neuron's OPC UA driver, it's essential first to switch the Prosys Simulation Server to Expert Mode. This can be done by selecting **Options** -> **Switch to Expert Mode** from the menu.

## Anonymous Login

1. Open the **Endpoints** -> **Security Modes**, deselect **Sign** and **Sign&Encrypt**, and select **None**.
    ![prosys-1](./assets/prosys-1.jpg)
2. Open the **Users** -> **User Authentication Methods**, deselect **Username&Password**, **Certificate** and **IssuedToken/External System**, and select **Anonymous**.
    ![prosys-2](./assets/prosys-2.jpg)
3. Save the settings and restart the Prosys OPC UA Simulation Server.

## Configure EMQX Neuron

1. Get the PLC measurement point information via the UaExpert software, refer to [UaExpert](./uaexpert.md).
1. EMQX Neuron adds a new southbound OPC UA device, opens **Device Configuration**, fills in the **Endpoint URL** of the target Server, without filling in username/password, without adding certificate/key, and starts the device connection.
1. Add **Groups** and **Tags** based on the measurement point information.

## Certificate/Key + Anonymous Login

1. Refer to [Connection policy](./policy.md) to generate or convert a certificate/key.
2. Open the **Endpoints** -> **Security Modes**, deselect **None**, and select **Sign** and **Sign&Encrypt**.
3. Open the **Users** -> **User Authentication Methods**, deselect **Username&Password**, **Certificate** and **IssuedToken/External System**, and select **Anonymous**.
4. Save the settings and restart the Prosys OPC UA Simulation Server.

## Configure EMQX Neuron

1. Get the PLC measurement point information via the UaExpert software, refer to [UaExpert](./uaexpert.md).
2. EMQX Neuron adds a new southbound OPC UA device, opens **Device Configuration**, fills in the **Endpoint URL** of the target Server, does not need to fill in the username/password, adds the certificate/key and starts the device connection.
3. Open the **Certificates** and set the client certificate in the list to Trust.
    ![prosys-3](./assets/prosys-3.jpg)

4. Add **Groups** and **Tags** based on the measurement point information.

## Username/Password Login

1. Open the **Endpoints** -> **Security Modes**, deselect **None**, and select **Sign** and **Sign&Encrypt**.

2. Open the **Users** -> **User Authentication Methods**, deselect **Anonymous**, **Certificate** and **IssuedToken/External System**, and select **Username&Password** to add a custom username/password.
    ![prosys-4](./assets/prosys-4.jpg)

3. Save the settings and restart the Prosys OPC UA Simulation Server.

## Configure EMQX Neuron

1. Get the PLC measurement point information via the UaExpert software, refer to [UaExpert](./uaexpert.md).
2. EMQX Neuron adds a new southbound OPC UA device, opens **Device Configuration**, fills in the **Endpoint URL** of the target Server, fills in the user name/password, no need to add certificate/key, and starts the device connection.
3. Open the **Certificates** and set the client certificate in the list to Trust.

4. Add **Groups** and **Tags** based on the measurement point information.

## Certificate/Key + Username/Password Login

For how to set the certificate/key and the username/password, see the **Certificate/Key + Anonymous Login** and **Username/Password Login** sections above.

## Configure EMQX Neuron

1. Get the PLC measurement point information via the UaExpert software, refer to [UaExpert](./uaexpert.md).

   ![prosys-5](./assets/prosys-5.jpg)

2. EMQX Neuron adds a new southbound OPC UA device, opens **Device Configuration**, fills in the **Endpoint URL** of the target Server, fills in the user name/password, adds the certificate/key, and starts the device connection(Change the **Update Mode** to Subscribe or Read&Subscribe to obtain data via OPC UA subscription.).

3. Open the **Certificates** and set the client certificate in the list to Trust.

4. Add **Groups** and **Tags** based on the measurement point information.

## Test Data List

|  Name    |  Address  | Attribute | Data Type  |
| -------- | ------ | ---- | ------ |
| Counter  | 3!1001 | Read | INT32  |
| Random   | 3!1002 | Read | DOUBLE |
| Sawtooth | 3!1003 | Read | DOUBLE |
| Sinusoid | 3!1004 | Read | DOUBLE |
| Square   | 3!1005 | Read | DOUBLE |
| Triangle | 3!1006 | Read | DOUBLE |