Allow retrieving ocpp handler

ocppj/client.go

@@ -54,16 +54,31 @@ func NewClient(id string, wsClient ws.WsClient, dispatcher ClientDispatcher, sta
 	return &Client{Endpoint: endpoint, client: wsClient, Id: id, dispatcher: dispatcher, RequestState: stateHandler}
 }
 
+// Return incoming requests handler.
+func (c *Client) GetRequestHandler() func(request ocpp.Request, requestId string, action string) {
+	return c.requestHandler
+}
+
 // Registers a handler for incoming requests.
 func (c *Client) SetRequestHandler(handler func(request ocpp.Request, requestId string, action string)) {
 	c.requestHandler = handler
 }
 
+// Return incoming responses handler.
+func (c *Client) GetResponseHandler() func(response ocpp.Response, requestId string) {
+	return c.responseHandler
+}
+
 // Registers a handler for incoming responses.
 func (c *Client) SetResponseHandler(handler func(response ocpp.Response, requestId string)) {
 	c.responseHandler = handler
 }
 
+// Return incoming error messages handler.
+func (c *Client) GetErrorHandler() func(err *ocpp.Error, details interface{}) {
+	return c.errorHandler
+}
+
 // Registers a handler for incoming error messages.
 func (c *Client) SetErrorHandler(handler func(err *ocpp.Error, details interface{})) {
 	c.errorHandler = handler