Systems and methods for reducing or eliminating use of read transactions by a message consuming device coupled through a shared bus to a message producing device to transfer a message from the producing device to the consuming device. Features and aspects hereof provide for use of only write transactions on the bus issued by the devices to transfer messages directly into the data memory of the consuming device. A memory manager on the producing device may manage allocation and freeing of buffer space within the data memory of the consuming device. The producing device notifies the consuming device when a message transfer is completed.