How to pass a file Buffer to MQTT APIs

[hassan-xy]

Hi guys,
I am tasked with performing OTA for zwave controller using our application(uses nodejs). I checked the API:
{"api":"firmwareUpdateOTW","args":[{"name":"zwave_ncp_serial_api_controller_BRD4207A.gbl","data":{}}]}

My question is How can I place zwave_ncp_serial_api_controller_BRD4207A.gbl file properly from my /root directory into the API?
I have tried /root/zwave_ncp_serial_api_controller_BRD4207A.gbl but I get error message.

Please share any information that might be of relevance.
Thanks

[robertsLando]

@hassan-xy Why you don't use the UI instead of the API?

[hassan-xy]

Because i will place my device in a remote location and won’t have access to the UI. So I need to hit the API. Can you suggest something.

Thanks

[robertsLando]

The arg of firmwareUpdateOTW is file that is like:

interface FwFile {
	name: string
	data: Buffer
	target?: number
}

So you should provide that as argument. Remember that for buffers the format is {"type": "Buffer", "data": [//the buffer data array] }

So:

{
    "api": "firmwareUpdateOTW",
    "args": [
        {
            "name": "zwave_ncp_serial_api_controller_BRD4207A.gbl",
            "data": {"type": "Buffer", "data": [//the buffer data array] }
        }
    ]
}