vehicle_status is a bitwise parameter. Each bit of this parameter has a certain meaning.
probably you know the meaning of bits and which bit shows ACC status.
Wialon has a functionality to control each bit of any parameters. Vehicle_status is registered as parameter "tr_status" in Wialon.
Usually our customers use "engine ignition sensor" in Wialon to control ACC status.
If for example ACC status is shown with bit0 of parameter "tr_status" it is necessary to create an engine ignition sensor and indicate "tr_status:11" as a parameter for the sensor.
there is a way can know the device alert or status from by the tr_status on wialon
Take the power on/ff as example :
device connected to power Tr_status_hex:EFE7DDFF binary system=1101111111001111101110111111111
device connected to power Tr_status_hex:FFFFDDFF binary system=1111111111111111101110111111111
the bitwise control mean that the total 31 position can be indicate each status or alert for device , so you can contrastive analysis the both power On and power off !
the position 29 bit for indicating others alert it is not about the power status , so it power on/off status on tr_status:20 power on/off alert on tr_status:21