Resolve "New Handler: REST client"

Closes #61 (closed)

pages/docs/handlers.md

@@ -14,6 +14,7 @@ Uses Java methods to supply values (receive) and for callbacks (send).
     - First leading slash not included in topic.
     - Currently, the default mappings are applied, which requires a consumer to expect `byte[]` (instead of a more intuitive token or node value). This might change in future versions.
 
+
 ## MQTT
 
 Use an MQTT broker to receive and send messages.
@@ -31,6 +32,7 @@ Use an MQTT broker to receive and send messages.
     - Mqtt is selected by default, so this dependency therefore is required "by default".
     - Might work with other versions of `org.fusesource.mqtt-client.mqtt.client` as well.
 
+
 ## REST Server
 
 Create a new REST server with its own target routes.
@@ -38,13 +40,14 @@ Create a new REST server with its own target routes.
 - Protocol identifier: `rest`
 - URI scheme: `rest://localhost[:port]/<path>`
 - Default port: 4567
-- Type for mapping definitions: `String` --> TODO --> `byte[]`
+- Type for mapping definitions: `byte[]`
 - Required runtime dependencies:
     - `group: 'com.sparkjava', name: 'spark-core', version: '2.9.3'`
 - Receive behaviour: Upon connection, create a new PUT connection and pass the value of every call to this PUT route to the receiving port.
 - Send behaviour: Upon connection, create a new GET connection and serve the latest value at this GET route.
 - Additional remarks:
     - Host is always `localhost`.
+    - Targets to be invoked need to replace `rest` with `http`
     - Might work with newer versions of `com.sparkjava.spark-core` as well.
     - For debugging, it is beneficial to include an implementation for [SLF4J][slf4j].
 
@@ -62,5 +65,6 @@ Invoke REST routes to fetch and send values.
 - Send behaviour: When the value to be sent changes, a PUT request sends this data.
 - Additional remarks:
     - Invoked target replaces `restClient` with `http`
+    - **Important constraint**: Receiving ports are only supported for tokens, since they interrupt the getter method!
 
 [slf4j]: https://www.slf4j.org/manual.html