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It is possible that packetbuf is modified by the call to mac_call_sent_callback. If this occurs ContikiMAC will not be able to recognize that a packet is pending. This fixes this problem by storing pending status in a local variable before calling mac_call_sent_callback.
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: