Configure MQTT Message from Template

You can choose the button Configure Message from Template to insert a specified character string in the dialog box that appears. This always makes sense if you already have the payload, for example, from a description or documentation. When you choose Apply, this data is automatically transferred as a parameter to the Message Configuration table and to the Tags table. This automatically creates the message configuration that is to be sent to PCo from the MQTT server. This function can be used for all available payload types. This procedure is very efficient and avoids typing errors.

Example

The syntax for a parameter name is structured in the following way for the payload type Formatted String: {$<variable name>[:<variable type> ]}

The parameter name (variable name) needs to start with a letter and can only contain letters and numbers. You can also specify the parameter type (variable type). The parameter type (variable type) might be, for example: byte, short, int, long, double, string. All parameter types that are offered in the combo box are possible. If you haven’t defined a parameter type, the default type string is used.

Here is an example of a message template for the payload type Formatted String:

Length: {$length:double}m, Width: {$width:double}m, Height: {$height:double}m

The MQTT message that arrives later in PCo looks like this, for example:

Length: 2m, Width: 1m, Height: 3m.

The parameters have been filled with tag values from the MQTT broker (server) and are displayed in the Tags table in the lower screen area. In this case, the Message Configuration table in the lower screen area is not input-enabled and remains empty.