Code snippet showing typical switch statement for hardware.wakereason(). In this example we're just logging the reason to the debug window, but we *could* be performing various tasks based on how the imp was woken up.

wakereason.device.nut

function logDeviceOnline() 
{
    local reasonString = "Unknown"
    switch(hardware.wakereason()) 
    {
        case WAKEREASON_POWER_ON: 
            reasonString = "The power was turned on"
            break
            
        case WAKEREASON_SW_RESET:
            reasonString = "A software reset took place"
            break
            
        case WAKEREASON_TIMER:
            reasonString = "An event timer fired"
            break
            
        case WAKEREASON_PIN1:
            reasonString = "Pulse detected on Wakeup Pin"
            break
            
        case WAKEREASON_NEW_SQUIRREL:
            reasonString = "New Squirrel code downloaded"
            break
            
        case WAKEREASON_SQUIRREL_ERROR:
            reasonString = "Squirrel runtime error"
            break
        
        case WAKEREASON_NEW_FIRMWARE:
            reasonString = "impOS update"
            break
        
        case WAKEREASON_SNOOZE:
            reasonString = "A snooze-and-retry event"
            break
            
        case WAKEREASON_HW_RESET:
            // imp003 only
            reasonString = "Hardware reset"
    }
    
    server.log("Reason for waking/reboot: " + reasonString)
} 

logDeviceOnline()