how to change timeout in "deviceService.sendTwoWayRpcCommand(entityId,requestBody)"

[hl1369]

Hello Every body,
i need to decrease timeout of this command API:
deviceService.sendTwoWayRpcCommand(entityId,requestBody)

the default time is about 6 second and for my point is a large time!
i tried this method: (but didn't change!)

let entityId = self.ctx.datasources[0].entityId
let requestBody = {
method: method,
params: paramsbodyclr,
timeout: '500'
}
deviceService.sendTwoWayRpcCommand(entityId,requestBody)
.subscribe(
function success() {
console.log("send ok CLR");
},
function fail(rejection) {
console.log("timeout detect CLR");
}
);

any body can help?