Set gateway into upgrade mode

https://api.sciener.com/v3/gateway/setUpgradeMode
Set gateway into upgrade mode remotely, when a gateway is in upgrade mode, it can't accept commands.

1. Description

Name	Type	Required	Description
clientId	String	Y	The app_id which is assigned by system when you create an application
accessToken	String	Y	Access token
gatewayId	Int	Y	Gateway ID
date	Long	Y	Current time (timestamp in millisecond)

2.Response

Parameter	Type	Description
errcode	Int	Error code
errmsg	String	Error message

4.Example of response

{
    "errcode": 0, 
    "errmsg": "none error message",
    "description": "none error message or means yes"
}