## Uses of Class
io.vertx.ext.stomp.Frame

- Packages that use Frame
  Package | Description
  --- | ---
  io.vertx.ext.stomp |
  io.vertx.reactivex.ext.stomp |
  io.vertx.rxjava3.ext.stomp |

- - ### Uses of Frame in io.vertx.ext.stomp

    Fields in io.vertx.ext.stomp declared as Frame
    Modifier and Type | Field | Description
    --- | --- | ---
    `static Frame` | Frames.`PING` |

    Methods in io.vertx.ext.stomp that return Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `Frame` | Frame.`addHeader​(String key, String value)` | Adds a header to the frame.
    `static Frame` | Frames.`createErrorFrame​(String message, Map<String,​String> headers, String body)` |
    `static Frame` | Frames.`createInvalidFrameErrorFrame​(io.vertx.ext.stomp.impl.FrameException exception)` |
    `static Frame` | Frames.`createReceiptFrame​(String receiptId, Map<String,​String> headers)` |
    `Frame` | ServerFrame.`frame()` |
    `static Frame` | Frames.`ping()` |
    `Frame` | Frame.`setBody​(Buffer body)` | Sets the body of the frame.
    `Frame` | Frame.`setCommand​(Command command)` | Sets the frame command.
    `Frame` | Frame.`setDestination​(String destination)` |
    `Frame` | Frame.`setHeaders​(Map<String,​String> headers)` | Sets the headers of the frames.
    `Frame` | Frame.`setId​(String id)` |
    `Frame` | Frame.`setTransaction​(String id)` |
    `Frame` | Acknowledgement.`subscription()` |

    Methods in io.vertx.ext.stomp that return types with arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `Future<Frame>` | StompClientConnection.`abort​(String id)` | Aborts a transaction.
    `Future<Frame>` | StompClientConnection.`abort​(String id, Map<String,​String> headers)` | Aborts a transaction.
    `Future<Frame>` | StompClientConnection.`ack​(String id)` | Sends an acknowledgement for a specific message.
    `Future<Frame>` | StompClientConnection.`ack​(String id, String txId)` | Sends an acknowledgement for the given frame.
    `Future<Frame>` | StompClientConnection.`beginTX​(String id)` | Begins a transaction.
    `Future<Frame>` | StompClientConnection.`beginTX​(String id, Map<String,​String> headers)` | Begins a transaction.
    `Future<Frame>` | StompClientConnection.`commit​(String id)` | Commits a transaction.
    `Future<Frame>` | StompClientConnection.`commit​(String id, Map<String,​String> headers)` | Commits a transaction.
    `Future<Frame>` | StompClientConnection.`disconnect()` | Disconnects the client.
    `Future<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `List<Frame>` | Acknowledgement.`frames()` |
    `Future<Frame>` | StompClientConnection.`nack​(String id)` | Sends a non-acknowledgement for the given message.
    `Future<Frame>` | StompClientConnection.`nack​(String id, String txId)` | Sends a non-acknowledgement for the given frame.
    `Future<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Future<Frame>` | StompClientConnection.`send​(String destination, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Future<Frame>` | StompClientConnection.`send​(String destination, Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Future<Frame>` | StompClientConnection.`send​(Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server.
    `Future<Frame>` | StompClientConnection.`unsubscribe​(String destination)` | Un-subscribes from the given destination.
    `Future<Frame>` | StompClientConnection.`unsubscribe​(String destination, Map<String,​String> headers)` | Un-subscribes from the given destination.

    Methods in io.vertx.ext.stomp with parameters of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | Destination.`ack​(StompServerConnection connection, Frame frame)` | Handles a `ACK` frame.
    `Future<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `Destination` | Destination.`dispatch​(StompServerConnection connection, Frame frame)` | Dispatches the given frame.
    `static void` | Frames.`handleReceipt​(Frame frame, StompServerConnection connection)` |
    `boolean` | Destination.`nack​(StompServerConnection connection, Frame frame)` | Handles a `NACK` frame.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `Future<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Destination` | Destination.`subscribe​(StompServerConnection connection, Frame frame)` | Handles a subscription request to the current `Destination`.
    `boolean` | Destination.`unsubscribe​(StompServerConnection connection, Frame frame)` | Handles a un-subscription request to the current `Destination`.
    `StompServerConnection` | StompServerConnection.`write​(Frame frame)` | Writes the given frame to the socket.

    Method parameters in io.vertx.ext.stomp with type arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `StompClient` | StompClient.`errorFrameHandler​(Handler<Frame> handler)` | A general error frame handler.
    `StompClientConnection` | StompClientConnection.`errorHandler​(Handler<Frame> handler)` | Sets a handler notified when an `ERROR` frame is received by the client.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `StompClient` | StompClient.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that gets notified when a STOMP frame is received by the client.
    `StompClientConnection` | StompClientConnection.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that get notified when a STOMP frame is received by the client.
    `Future<String>` | StompClientConnection.`subscribe​(String destination, Handler<Frame> handler)` | Subscribes to the given destination.
    `Future<String>` | StompClientConnection.`subscribe​(String destination, Map<String,​String> headers, Handler<Frame> handler)` | Subscribes to the given destination.
    `StompClient` | StompClient.`writingFrameHandler​(Handler<Frame> handler)` | Configures a writing handler that gets notified when a STOMP frame is written on the wire.
    `StompClientConnection` | StompClientConnection.`writingFrameHandler​(Handler<Frame> handler)` | Configures a handler notified when a frame is going to be written on the wire.

    Constructors in io.vertx.ext.stomp with parameters of type Frame
    Constructor | Description
    --- | ---
    `Frame​(Frame other)` | Creates a new instance of `Frame` by copying the values from the `other` frame.

  - ### Uses of Frame in io.vertx.reactivex.ext.stomp

    Fields in io.vertx.reactivex.ext.stomp declared as Frame
    Modifier and Type | Field | Description
    --- | --- | ---
    `static Frame` | Frames.`PING` |

    Methods in io.vertx.reactivex.ext.stomp that return Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `static Frame` | Frames.`createErrorFrame​(String message, Map<String,​String> headers, String body)` |
    `static Frame` | Frames.`createReceiptFrame​(String receiptId, Map<String,​String> headers)` |
    `Frame` | ServerFrame.`frame()` |
    `static Frame` | Frames.`ping()` |
    `Frame` | Acknowledgement.`subscription()` |

    Methods in io.vertx.reactivex.ext.stomp that return types with arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `Future<Frame>` | StompClientConnection.`abort​(String id)` | Aborts a transaction.
    `Future<Frame>` | StompClientConnection.`abort​(String id, Map<String,​String> headers)` | Aborts a transaction.
    `Future<Frame>` | StompClientConnection.`ack​(String id)` | Sends an acknowledgement for a specific message.
    `Future<Frame>` | StompClientConnection.`ack​(String id, String txId)` | Sends an acknowledgement for the given frame.
    `Future<Frame>` | StompClientConnection.`beginTX​(String id)` | Begins a transaction.
    `Future<Frame>` | StompClientConnection.`beginTX​(String id, Map<String,​String> headers)` | Begins a transaction.
    `Future<Frame>` | StompClientConnection.`commit​(String id)` | Commits a transaction.
    `Future<Frame>` | StompClientConnection.`commit​(String id, Map<String,​String> headers)` | Commits a transaction.
    `Future<Frame>` | StompClientConnection.`disconnect()` | Disconnects the client.
    `Future<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `List<Frame>` | Acknowledgement.`frames()` |
    `Future<Frame>` | StompClientConnection.`nack​(String id)` | Sends a non-acknowledgement for the given message.
    `Future<Frame>` | StompClientConnection.`nack​(String id, String txId)` | Sends a non-acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxAbort​(String id)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`rxAbort​(String id, Map<String,​String> headers)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`rxAck​(String id)` | Sends an acknowledgement for a specific message.
    `Single<Frame>` | StompClientConnection.`rxAck​(String id, String txId)` | Sends an acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxBeginTX​(String id)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`rxBeginTX​(String id, Map<String,​String> headers)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`rxCommit​(String id)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`rxCommit​(String id, Map<String,​String> headers)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`rxDisconnect()` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxDisconnect​(Frame frame)` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxNack​(String id)` | Sends a non-acknowledgement for the given message.
    `Single<Frame>` | StompClientConnection.`rxNack​(String id, String txId)` | Sends a non-acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxSend​(Frame frame)` | Sends the given frame to the server.
    `Single<Frame>` | StompClientConnection.`rxSend​(String destination, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`rxSend​(String destination, Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`rxSend​(Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server.
    `Single<Frame>` | StompClientConnection.`rxUnsubscribe​(String destination)` | Un-subscribes from the given destination.
    `Single<Frame>` | StompClientConnection.`rxUnsubscribe​(String destination, Map<String,​String> headers)` | Un-subscribes from the given destination.
    `Future<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Future<Frame>` | StompClientConnection.`send​(String destination, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Future<Frame>` | StompClientConnection.`send​(String destination, Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Future<Frame>` | StompClientConnection.`send​(Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server.
    `Future<Frame>` | StompClientConnection.`unsubscribe​(String destination)` | Un-subscribes from the given destination.
    `Future<Frame>` | StompClientConnection.`unsubscribe​(String destination, Map<String,​String> headers)` | Un-subscribes from the given destination.

    Methods in io.vertx.reactivex.ext.stomp with parameters of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | Destination.`ack​(StompServerConnection connection, Frame frame)` | Handles a `ACK` frame.
    `Future<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `Destination` | Destination.`dispatch​(StompServerConnection connection, Frame frame)` | Dispatches the given frame.
    `static void` | Frames.`handleReceipt​(Frame frame, StompServerConnection connection)` |
    `boolean` | Destination.`nack​(StompServerConnection connection, Frame frame)` | Handles a `NACK` frame.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `Single<Frame>` | StompClientConnection.`rxDisconnect​(Frame frame)` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxSend​(Frame frame)` | Sends the given frame to the server.
    `Future<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Destination` | Destination.`subscribe​(StompServerConnection connection, Frame frame)` | Handles a subscription request to the current `Destination`.
    `boolean` | Destination.`unsubscribe​(StompServerConnection connection, Frame frame)` | Handles a un-subscription request to the current `Destination`.
    `StompServerConnection` | StompServerConnection.`write​(Frame frame)` | Writes the given frame to the socket.

    Method parameters in io.vertx.reactivex.ext.stomp with type arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `StompClient` | StompClient.`errorFrameHandler​(Handler<Frame> handler)` | A general error frame handler.
    `StompClientConnection` | StompClientConnection.`errorHandler​(Handler<Frame> handler)` | Sets a handler notified when an `ERROR` frame is received by the client.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `StompClient` | StompClient.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that gets notified when a STOMP frame is received by the client.
    `StompClientConnection` | StompClientConnection.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that get notified when a STOMP frame is received by the client.
    `Single<String>` | StompClientConnection.`rxSubscribe​(String destination, Handler<Frame> handler)` | Subscribes to the given destination.
    `Single<String>` | StompClientConnection.`rxSubscribe​(String destination, Map<String,​String> headers, Handler<Frame> handler)` | Subscribes to the given destination.
    `Future<String>` | StompClientConnection.`subscribe​(String destination, Handler<Frame> handler)` | Subscribes to the given destination.
    `Future<String>` | StompClientConnection.`subscribe​(String destination, Map<String,​String> headers, Handler<Frame> handler)` | Subscribes to the given destination.
    `StompClient` | StompClient.`writingFrameHandler​(Handler<Frame> handler)` | Configures a writing handler that gets notified when a STOMP frame is written on the wire.
    `StompClientConnection` | StompClientConnection.`writingFrameHandler​(Handler<Frame> handler)` | Configures a handler notified when a frame is going to be written on the wire.

  - ### Uses of Frame in io.vertx.rxjava3.ext.stomp

    Fields in io.vertx.rxjava3.ext.stomp declared as Frame
    Modifier and Type | Field | Description
    --- | --- | ---
    `static Frame` | Frames.`PING` |

    Methods in io.vertx.rxjava3.ext.stomp that return Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `static Frame` | Frames.`createErrorFrame​(String message, Map<String,​String> headers, String body)` |
    `static Frame` | Frames.`createReceiptFrame​(String receiptId, Map<String,​String> headers)` |
    `Frame` | ServerFrame.`frame()` |
    `static Frame` | Frames.`ping()` |
    `Frame` | Acknowledgement.`subscription()` |

    Methods in io.vertx.rxjava3.ext.stomp that return types with arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `Single<Frame>` | StompClientConnection.`abort​(String id)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`abort​(String id, Map<String,​String> headers)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`ack​(String id)` | Sends an acknowledgement for a specific message.
    `Single<Frame>` | StompClientConnection.`ack​(String id, String txId)` | Sends an acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`beginTX​(String id)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`beginTX​(String id, Map<String,​String> headers)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`commit​(String id)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`commit​(String id, Map<String,​String> headers)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`disconnect()` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `List<Frame>` | Acknowledgement.`frames()` |
    `Single<Frame>` | StompClientConnection.`nack​(String id)` | Sends a non-acknowledgement for the given message.
    `Single<Frame>` | StompClientConnection.`nack​(String id, String txId)` | Sends a non-acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxAbort​(String id)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`rxAbort​(String id, Map<String,​String> headers)` | Aborts a transaction.
    `Single<Frame>` | StompClientConnection.`rxAck​(String id)` | Sends an acknowledgement for a specific message.
    `Single<Frame>` | StompClientConnection.`rxAck​(String id, String txId)` | Sends an acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxBeginTX​(String id)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`rxBeginTX​(String id, Map<String,​String> headers)` | Begins a transaction.
    `Single<Frame>` | StompClientConnection.`rxCommit​(String id)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`rxCommit​(String id, Map<String,​String> headers)` | Commits a transaction.
    `Single<Frame>` | StompClientConnection.`rxDisconnect()` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxDisconnect​(Frame frame)` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxNack​(String id)` | Sends a non-acknowledgement for the given message.
    `Single<Frame>` | StompClientConnection.`rxNack​(String id, String txId)` | Sends a non-acknowledgement for the given frame.
    `Single<Frame>` | StompClientConnection.`rxSend​(Frame frame)` | Sends the given frame to the server.
    `Single<Frame>` | StompClientConnection.`rxSend​(String destination, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`rxSend​(String destination, Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`rxSend​(Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server.
    `Single<Frame>` | StompClientConnection.`rxUnsubscribe​(String destination)` | Un-subscribes from the given destination.
    `Single<Frame>` | StompClientConnection.`rxUnsubscribe​(String destination, Map<String,​String> headers)` | Un-subscribes from the given destination.
    `Single<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Single<Frame>` | StompClientConnection.`send​(String destination, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`send​(String destination, Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server to the given destination.
    `Single<Frame>` | StompClientConnection.`send​(Map<String,​String> headers, Buffer body)` | Sends a `SEND` frame to the server.
    `Single<Frame>` | StompClientConnection.`unsubscribe​(String destination)` | Un-subscribes from the given destination.
    `Single<Frame>` | StompClientConnection.`unsubscribe​(String destination, Map<String,​String> headers)` | Un-subscribes from the given destination.

    Methods in io.vertx.rxjava3.ext.stomp with parameters of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `boolean` | Destination.`ack​(StompServerConnection connection, Frame frame)` | Handles a `ACK` frame.
    `Single<Frame>` | StompClientConnection.`disconnect​(Frame frame)` | Disconnects the client.
    `Destination` | Destination.`dispatch​(StompServerConnection connection, Frame frame)` | Dispatches the given frame.
    `static void` | Frames.`handleReceipt​(Frame frame, StompServerConnection connection)` |
    `boolean` | Destination.`nack​(StompServerConnection connection, Frame frame)` | Handles a `NACK` frame.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `Single<Frame>` | StompClientConnection.`rxDisconnect​(Frame frame)` | Disconnects the client.
    `Single<Frame>` | StompClientConnection.`rxSend​(Frame frame)` | Sends the given frame to the server.
    `Single<Frame>` | StompClientConnection.`send​(Frame frame)` | Sends the given frame to the server.
    `Destination` | Destination.`subscribe​(StompServerConnection connection, Frame frame)` | Handles a subscription request to the current `Destination`.
    `boolean` | Destination.`unsubscribe​(StompServerConnection connection, Frame frame)` | Handles a un-subscription request to the current `Destination`.
    `StompServerConnection` | StompServerConnection.`write​(Frame frame)` | Writes the given frame to the socket.

    Method parameters in io.vertx.rxjava3.ext.stomp with type arguments of type Frame
    Modifier and Type | Method | Description
    --- | --- | ---
    `StompClient` | StompClient.`errorFrameHandler​(Handler<Frame> handler)` | A general error frame handler.
    `StompClientConnection` | StompClientConnection.`errorHandler​(Handler<Frame> handler)` | Sets a handler notified when an `ERROR` frame is received by the client.
    `StompServerHandler` | StompServerHandler.`onAck​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are acknowledged.
    `StompServerHandler` | StompServerHandler.`onNack​(StompServerConnection connection, Frame subscribe, List<Frame> messages)` | Method called by single message (client-individual policy) or a set of message (client policy) are not acknowledged.
    `StompClient` | StompClient.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that gets notified when a STOMP frame is received by the client.
    `StompClientConnection` | StompClientConnection.`receivedFrameHandler​(Handler<Frame> handler)` | Configures a received handler that get notified when a STOMP frame is received by the client.
    `Single<String>` | StompClientConnection.`rxSubscribe​(String destination, Handler<Frame> handler)` | Subscribes to the given destination.
    `Single<String>` | StompClientConnection.`rxSubscribe​(String destination, Map<String,​String> headers, Handler<Frame> handler)` | Subscribes to the given destination.
    `Single<String>` | StompClientConnection.`subscribe​(String destination, Handler<Frame> handler)` | Subscribes to the given destination.
    `Single<String>` | StompClientConnection.`subscribe​(String destination, Map<String,​String> headers, Handler<Frame> handler)` | Subscribes to the given destination.
    `StompClient` | StompClient.`writingFrameHandler​(Handler<Frame> handler)` | Configures a writing handler that gets notified when a STOMP frame is written on the wire.
    `StompClientConnection` | StompClientConnection.`writingFrameHandler​(Handler<Frame> handler)` | Configures a handler notified when a frame is going to be written on the wire.