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Due to errors in mspsim and/or radio drivers, packets of incorrect length are sometimes transmitted. The length might be larger than the 127-byte maximum (considered negative in the current code) or not matching the actual number of transmitted bytes. This leads to wrong packet delimiting when converting from the mspsim-level stream of bytes to Cooja-level packets causing unhandled exceptions that terminate the simulation. This patch checks the frame preamble (0000007A) and the length field. If they are wrong, no decoding attempt is done. The transmitted bytes are still delivered to the receivers untouched. The connection is terminated when the radio state is changed (which alway s happens when TX is done).
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: