  Given the success of IoT platforms, more developers and companies want to
include the technology in their portfolio. However, in the case of single board
microcontrollers, the support for networking operations is not ideal, and
different IoT platforms allow access to the networking submodule via different
libraries and system calls, leading to a steeper learning curve. Code
generators for API clients can enhance productivity, but they tend to generate
universal purpose code, and on the other hand the networking primitives of IoT
devices are platform specific, especially when security mechanisms such as
Transport Layer Security are part of the picture. This paper presents
\texttt{cpp-tiny-client}, an API client generator developed as a plugin for the
OpenAPI Generator project, which can tailor the generated code based on the IoT
platform specified by the user. Our work allows to generate correct code for
API clients for IoT devices, and thus can empower a developer with more
productivity and a faster time-to-market for its own applications. By combining
together mainstream technologies only, \texttt{cpp-tiny-client} offers a gentle
learning curve. Moreover, experiments show that the generated code has a
reasonable footprint, at least with respect to the IoT devices that were used
in the validation of the work. The code related to this work is available
through the OpenAPI Generator project~\cite{OpenAPIGenerator}. This technical
report is an extension of~\cite{acmsac22}, and it integrates the information
presented at the ACM SAC 2022 conference.
