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1. Human to Machine (H2M)
Human provides input to IoT devices, i.e. voice/text/image etc. IoT devices (machines), such as sensors and actuators, then understand the input, analyze it and reply to the human via text or visual display. This is very useful as these machines can help humans in every daily task.
2. Machine to Human (M2H)
Interact with human in this machine. The machine triggers messages (text messages/images/speech/signals) individually/independently of the presence of any person. This type of communication is most often used where the machine instructs humans in their daily lives. This is where humans interact with intelligent systems and other machines by using tools or devices to collaborate on tasks.
3. Machine-to-Machine (M2M)
Interaction or communication between machines through automated data/programs. Communication is required in this machine-level instruction. Here, communication takes place without human interaction. These machines can be connected via wired or wireless connections. an M2M connection is a point-to-point connection between two networked devices and facilitates the transfer of information using public network technologies such as Ethernet and cellular networks. The IoT uses the basic concept of M2M and extends it by creating large "cloud" networks of devices that communicate with each other through a cloud networking platform.