Never mind. I have figured this out
We need to make a POST call using the filters:
/api/public/v6_1/query/client
$data = '{
"filters": [
{
"type": "WLAN",
"value": "WLANID"
}
],
"fullTextSearch": {
"type": "AND",
"value": "SSID-NAME"
},
"attributes": [
"*"
]
}';
From the output we can use the [txBytes] and [rxBytes] for b/w collection