"bt": {
  "enable": true,             // Enabled by default. Disabled on first reboot with WiFi on
  "dev_name": "",             // Device name. If empty, value equals to device.id
  "adv_enable": true,         // Advertise our Bluetooth services
  "keep_enabled": true,       // Keep enabled after successful boot with WiFi on
  "scan_rsp_data_hex": "",    // Custom scan response data, as hex string (e.g. `48656c6c6f` for `Hello`)
  "allow_pairing": true,      // Allow pairingbonding with other devices
  "max_paired_devices": 10,   // Allow pairing with up to this many devices; -1 - no limit
  "gatts": {
    "min_sec_level": 0,       // Minimum security level for all attributes of all services.
                              // 0 - no auth required, 1 - auth reqd, 2 - auth + encryption reqd, 3 - auth + encryption + MITM reqd
    "require_pairing": false  // Require taht device is paired before accessing services
  }
}