Q:

Here API Indoor discovery

I am trying to get the venue list using the API
https://indoor-discovery.venue.maps.api.here.com/discovery/v2?app_id=XXXXXXXXXXXXXXXXXXXX&app_code=XXXXXXXXXXXXXXXXXXXX&at=31.2403,74.6354,8.6291,77.5743
The "at" parameter almost covers the country.  but the results always come back as
{
    "hostname": "ip-10-13-214-44",
    "type": "venues",
    "status": {
        "code": "OK",
        "reason": "DISCOVERY_SUCCESSFULL"
    },
    "results": {
        "items": []
    }
}

A:

The maximum value for the bounding box is at 100km x 100km.  If you search within a smaller area you will get some results in the list.  Here is one for the coverage of Chennai:
https://indoor-discovery.venue.maps.api.here.com/discovery/v2?app_id=yyy&app_code=xxxx&at=13.2403,79.8454,12.7291,80.5743

{
"hostname": "ip-10-13-214-44",
"type": "venues",
"status": {
    "code": "OK",
    "reason": "DISCOVERY_SUCCESSFULL"
},
"results": {
    "items": [
        {
            "id": "DM_17331",
            "title": "Phoenix Marketcity Mall",
            "address": {
                "countryCode": "IND",
                "city": "Chennai",
                "postalCode": "600042",
                "street": "Radha Mohan Street",
                "house": ""
            },
            "position": [
                12.991487949990416,
                80.21652530007341
            ],
            "distance": 1045.380777404391,
            "type": "urn:nlp-types:venue",
            "vicinity": "Radha Mohan Street,600042,Chennai,IND",
            "bbox": [
                [
                    12.992687434189028,
                    80.21572801724027
                ],
                [
                    12.990288596080005,
                    80.21732267846822
                ]
            ],
            "minFloor": -1,
            "maxFloor": 3,
            "namespace": "public"
        },
        {
            "id": "DM_3869",
            "title": "Maya Plaza",
            "address": {
                "countryCode": "IND",
                "city": "Chennai",
                "postalCode": "600017",
                "street": "Sir Thyagaraya Road",
                "house": ""
            },
            "position": [
                13.041404800089397,
                80.23480899848522
            ],
            "distance": 6860.646286724997,
            "type": "urn:nlp-types:venue",
            "vicinity": "Sir Thyagaraya Road,600017,Chennai,IND",
            "bbox": [
                [
                    13.041557002816027,
                    80.23472596161558
                ],
                [
                    13.04125261448761,
                    80.23489217568006
                ]
            ],
            "minFloor": 0,
            "maxFloor": 4,
            "namespace": "public"
        },
        {
            "id": "DM_3866",
            "title": "Challa Mall",
            "address": {
                "countryCode": "IND",
                "city": "Chennai",
                "postalCode": "600017",
                "street": "Sir Thyagaraya Road",
                "house": ""
            },
            "position": [
                13.040501949969517,
                80.24325910031074
            ],
            "distance": 7183.4301593814025,
            "type": "urn:nlp-types:venue",
            "vicinity": "Sir Thyagaraya Road,600017,Chennai,IND",
            "bbox": [
                [
                    13.040704496188196,
                    80.24306093132118
                ],
                [
                    13.040299554031115,
                    80.24345735684514
                ]
            ],
            "minFloor": -1,
            "maxFloor": 1,
            "namespace": "public"
        },
        {
            "id": "DM_3871",
            "title": "Kasi Arcade Mall",
            "address": {
                "countryCode": "IND",
                "city": "Chennai",
                "postalCode": "600017",
                "street": "Sir Thyagaraya Road",
                "house": ""
            },
            "position": [
                13.040300249964666,
                80.24435859999508
            ],
            "distance": 7224.9813794400025,
            "type": "urn:nlp-types:venue",
            "vicinity": "Sir Thyagaraya Road,600017,Chennai,IND",
            "bbox": [
                [
                    13.040532567087016,
                    80.24415738929856
                ],
                [
                    13.04006805606027,
                    80.24455999517599
                ]
            ],
            "minFloor": -1,
            "maxFloor": 1,
            "namespace": "public"
        },

