protected MeshMessageState getState(final int address) {
        MeshMessageState state = stateSparseArray.get(address);
        if (state == null) {
            state = new DefaultNoOperationMessageState(null, getTransport(address),
                    this, mInternalTransportCallbacks, mStatusCallbacks);
            stateSparseArray.put(address, state);
        }
        return state;
    }
Returns the existing state or a new state if nothing exists for a node

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