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\section{Related Work}\label{related}
Wireless sensor and actor networks are a crucial elements of today's effort to support and implement \textit{Industry 4.0} architectures and modern manufacturing processes.
Small programmable logic controllers (PLC) and cloud computing are enabler but also drivers of these new manufacturing paradigms\cite{Nigappa:2016eb}.
Thus, the networked interconnection of everyday objects, the automation of home appliances and environmental metering and monitoring based on sensor and actor networks controlled by ESP-based chipsets are subject of current research.
In \cite{DiNisio:2015fg}, a low-cost multipurpose wireless sensor network using \textit{ESP8266} PLCs is introduced.
The usage of \textit{ESP8266} PLCs in combination with Raspberry PI acting as base station for the sensors is discussed in \cite{Thaker:2016fi}.
The article \cite{Kodali:2016hc} presents a home automation solution based on a \textit{MQTT} message queue with \textit{ESP8266}-based sensors and actors.
The control of smart bulbs with PLCs is summarized in \cite{Walia:2016bj}.
Unfortunately, soft ware update mechanisms are not addressed in these publications.
The importance of regular security updates for today's infrastructures is summarized in \cite{beresford2016whack}.
An approach of decentralized software updates in Contiki-based IoT environments are introduced in \cite{Ruckebusch:2016vo}.
In \cite{Weisbach:2016bs}, a software update solution for devices able to execute a Java Virtual Machine (JVM) is introduced.
Both solutions are not applicable for small MCU devices.
In \cite{Mansour:2012fu}, a diagnoses and update system for embedded software of electronics control units in vehicles is introduced.
Secure firmware updates targeted for the automotive industry is introduced in \cite{Nilsson:2008ik}.
Furthermore, a secure The \textit{Over the Air} programming capabilities of the \textit{ESP8266} PLCs are described in \cite{Gore:2016ue}.