JS API: Get Unit's last ignition-off time

This method is asynchronous, try this:

u.getIgnitionHistory(1, 1527973200, 1530565200, 0, null, function(error, result) {
    console.log(error, result);
});

(0 and null is sensorId and sensorsNameMask respectively)

I think, that it is a best and simplier way to do this.

There is also Message params. If your ignition is a single param and can have only two values, then there is ct field, that represents time of last value change.

And then if value is 1, ignition is on right now. If 0 — ct is a time, when it is switched from 1. But if ignition is inside bitmask, this method can't help you.

Other alternatives is to fetch messages/execute report, but getIgnitionHistory is preferred.

So I am now running the code below

u.getIgnitionHistory(1, t_from, t_to, 0, 'Ignition', function(error, result) {
                        console.log("ignition history");
                        console.log(error, result);
 });

And for some units I get an empty array as below

ignition:{}

And for others I get the result below but all have value 1. Does it mean that the vehicles ignition never goes off or am I pulling the wrong data?

ignition:{3: Array(20)}

{
f:0
from:{t: 1530163228, y: 0.295774489641, x: 30.1825046539}
hours:668713
m:1530163660
state:1
switches:255
to:{t: 1530163663, y: 0.295774489641, x: 30.1825046539}
type:1
value:1
}