Updating software in wireless sensor networks a survey Ree localsex cam
To save energy the transmission range of each sensor is severely limited so that data packets that should be transmitted across the network have to be forwarded via multiple hops.Due to topology changes, interferences caused by environmental influences or adversaries, node failures or perishing energy resources, the routing has to be failure-tolerant and has to adapt permanently, while using as little energy as possible.However, in general, about half of the memory is already used by the sensor’s operating system.Among the most common OS for WSNs are Tiny OS , Contiki , MANTIS , THINK , micro C/OS-II  and nano-RK .
In Section 5, measures for secure routing in WSNs are discussed; including cryptography, key establishment, trust & reputation and secure localization; considering solutions proposed by other researchers in this area.
Instead, most of the current routing protocols aiming at metrics such as reliability, robustness, responsiveness and preserving energy.
However, the nonconsideration of possible security issues in the area of routing can be fatal because in almost all application areas in which WSNs are used, sensor nodes are deployed in hostile or unattended environments, providing the opportunity for adversaries to launch certain attacks against sensor nodes.
the supplied energy must outlast the sensor’s life.
This is resulting from the fact that the sensor’s battery can neither be replaced nor recharged, once deployed in a difficult to access area or hostile environment.