Connection Issues Regarding Ble Sensor in IOS using Ionic-ble plugin

When IOS app connect tzone with BLE service
It is not sending data
See here in connect response:
{“characteristics”:[{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B11-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B12-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B13-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B14-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B15-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B16-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B17-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”],“isNotifying”:false,“characteristic”:“27763B18-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B19-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B20-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Notify”],“isNotifying”:false,“characteristic”:“27763B21-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B22-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”],“isNotifying”:false,“characteristic”:“27763B23-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B27-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B28-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B29-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B2A-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B2B-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B31-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“Read”,“Write”],“isNotifying”:false,“characteristic”:“27763B40-999C-4D6A-9FC4-C7272BE10900”,“service”:“27763B10-999C-4D6A-9FC4-C7272BE10900”},{“properties”:[“WriteWithoutResponse”],“isNotifying”:false,“characteristic”:“00001532-1212-EFDE-1523-785FEABCD123”,“service”:“00001530-1212-EFDE-1523-785FEABCD123”},{“properties”:[“Write”,“Notify”],“isNotifying”:false,“characteristic”:“00001531-1212-EFDE-1523-785FEABCD123”,“service”:“00001530-1212-EFDE-1523-785FEABCD123”},{“properties”:[“Read”],“isNotifying”:false,“characteristic”:“00001534-1212-EFDE-1523-785FEABCD123”,“service”:“00001530-1212-EFDE-1523-785FEABCD123”}],“id”:“D162ED8C-C3FD-483F-0CBA-09D5FC344BBC”,“rssi”:-42,“advertising”:{“kCBAdvDataLocalName”:“DRG-286”,“kCBAdvDataIsConnectable”:1,“kCBAdvDataServiceData”:{“CBFF”:{}}},“name”:“DRG-286”,“services”:[“27763B10-999C-4D6A-9FC4-C7272BE10900”,“00001530-1212-EFDE-1523-785FEABCD123”]}

it is sending blank in kCBAdvDataServiceData.CBFF

Please suggest why it is happening.