Recommended config for using the headset HS3100 in NFC mode:
_vxt_configuration.jcf
"Microphone": { "Mode": "NFC", "AskUser": "0", "Bluetooth": { "Filter": "HS3100", "PIN": "", "UnpairAll": false, "UseDeviceMajor": true, "IntentScanner": { "Action":"", "Extra":"", "HasCategory": false, "Category": "" }, "UseScanCamera": false, "AbortSpeechWhenLost": false, "ScoReconnectTime": 999, "ReconnectText": "Headset reconnected", "AudioMode": "MODE_NATIVE" } },