How schedular handles the different tasks in Z-stack

The Z-Stack "scheduler" is very simple -- each time a task returns control to OSAL, the search of the task list starts at the first entry in the tasksArr[] table. Therefore, macTask is the highest priorty task and will always have the opportunity run before any others. I would suggest that you add your 2 tasks to the bottom of the table and call their Init functions from the bottom of osalInitTasks(). Typically, user-defined tasks should be added in this way (lowest priority).