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S. Qanbari, S. Mahdi Zadeh, S. Dustdar, N. Behinaein, R. Rahimzadeh:
"Diameter of Things (DoT): A Protocol for Real-time Telemetry of IoT Applications";
Report for Internet Engineering Task Force (IETF); 2015; 40 pages.

The Diameter of Things (DoT) protocol is intended to provide a realtime metering framework for IoT applications in resource-constraint gateways. Respecting resource capacity constraints on edge devices establishes a firm requirement for a lightweight protocol in support of fine-grained telemetry of IoT deployment units. Such metering capability is needed when lack of resources among competing
applications dictates our schedule and credit allocation. In response
to these findings, the authors offer the DoT protocol that can be
incorporated to implement real-time metering of IoT services for
prepaid subscribers as well as Pay-per-use economic models. The DoT
employs mechanisms to handle the composite application resource usage
units consumed/charged against a single user balance. Such charging
methods come in two models of time-based and event-based patterns. The
former is used for scenarios where the charged units are continuously
consumed while the latter is typically used when units are implicit
invocation events. The DoT-enabled platform performs a chained
metering transaction on a graph of dependent IoT microservices,
collects the emitted usage data, then generates billable artifacts
from the chain of metering tokens. Finally it permits micropayments to
take place in parallel.