ABSTRACT
Mainstream Near Field Communication (NFC) IoT mechanisms rely on radio communications that are affected by the performance of the overcrowded Industrial Scientific and Medical (ISM) bands. In this context, the use of ultrasonic physical layers has been introduced as a valid alternative to some of these limitations. This chapter explores the use of the well-known International Telecommunications Union (ITU) V.23 modulation standard adapted to ultrasonic communications. This physical layer serves as building block of a fully compliant IoT stack. To this end, in order to support end-to-end IPv6 connectivity that is a requirement of most modern IoT topologies, the chapter presents an adaptation layer that is based on the well-known IPv6 over Low Power Wireless Personal Area Networks (6LoWPAN) protocol. Session and application layers, that result from the use of other popular IoT protocols like the Constrained Application Protocol (CoAP), complete the stack. The stack is modeled to analyze the effects of inter-device distance on throughput and application packet loss and validated by means of a practical experimental framework.
