     static let controlChar = String(format: "%C", arguments: [0x00])
     
     // Ack Mode
+    static let ackClientIndividual = "client-individual"
     static let ackClient = "client"
     static let ackAuto = "auto"
     // Header Commands

        case StompAckMode.ClientMode:
            ack = StompCommands.ackClient
            break
        default:
            ack = StompCommands.ackAuto
            break

    static let commandHeaderContentType = "content-type"
    static let commandHeaderAck = "ack"
    static let commandHeaderTransaction = "transaction"
    static let commandHeaderMessageId = "id"
    static let commandHeaderSubscription = "subscription"
    static let commandHeaderDisconnected = "disconnected"
    static let commandHeaderHeartBeat = "heart-beat"
