private MeshTransport getTransport(final int address) {
        MeshTransport transport = transportSparseArray.get(address);
        if (transport == null) {
            transport = new MeshTransport(mContext);
            transport.setNetworkLayerCallbacks(networkLayerCallbacks);
            transport.setUpperTransportLayerCallbacks(upperTransportLayerCallbacks);
            transportSparseArray.put(address, transport);
        }
        return transport;
    }
Returns the existing transport of the node or a new transport if nothing exists

@param address address of the node
mesh/src/main/java/no/nordicsemi/android/mesh/transport/BaseMeshMessageHandler.java