Transport of CoAP over SMS

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Last updated 2015-02-09 (latest revision 2014-08-08)
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Short Message Service (SMS) of mobile cellular networks is frequently used in Machine-To-Machine (M2M) communications, such as for telematic devices. The service offers small packet sizes and high delays just as other typical low-power and lossy networks (LLNs), i.e. 6LoWPANs. The design of the Constrained Application Protocol (CoAP) [RFC7252], that took the limitations of LLNs into account, is thus also applicable to other transports. The adaptation of CoAP to SMS transport mechanisms is described in this document.


Markus Becker (
Kepeng Li (
Koojana Kuladinithi (
Thomas Poetsch (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)