Operation Manual

key when a key is requested (it is up to user to respond to the key request event). Authentication of Bluetooth devices

is based-upon a challenge-response transaction. Bluetooth allows for a PIN or passkey used to create other 128-bit

keys used for security and encryption. The encryption key is derived from the link key used to authenticate the pairing

devices. Also worthy of note is the limited range and fast frequency hopping of the Bluetooth radios that makes long-

distance eavesdropping difficult.

Recommendations are:

• Perform pairing in a secure environment

• Keep PIN codes private and do not store the PIN codes in the device

• Implement application-level security.

Bluetooth Profiles

The ET1 supports the following Bluetooth services:

• Generic Access Profile (GAP) - Must support both Initiator and Acceptor roles.

• Service Discovery Protocol (SDP) - Supports both Local Device and Remote Device.

• Serial Port Profile (SPP) - Supports both Device A and Device B roles.

• Human Interface Device (HID) Profile - Supports Host role.

• Dial-up Networking (DUN) Profile - Supports connecting a computer to the ET1 to access the internet.

Bluetooth Power States

The Bluetooth radio is off by default.

• Suspend — When there is no active Bluetooth connections, the Bluetooth radio turns off.

Note: If there is an active Bluetooth connection between the ET1 and another Bluetooth device and

there is no data activity, the ET1 will time out. However, if the user presses the Power button on the

ET1, the ET1 will suspend and upon receiving data from a remote Bluetooth device, the ET1 will wake

from suspend mode. For example, Bluetooth scanner sending data to the ET1.

• Resume — When the ET1 resumes, Bluetooth turns on if it was on prior to suspend.

• Airplane Mode — When the ET1 is placed in Airplane Mode, the Bluetooth radio turns off. When Airplane

Mode is disabled, the Bluetooth radio returns to the prior state.

Bluetooth Radio Power – Android

Turn off the Bluetooth radio to save power or if entering an area with radio restrictions (e.g., an airplane). When the

radio is off, other Bluetooth devices cannot see or connect to the device. Turn on the Bluetooth radio to exchange

information with other Bluetooth devices (within range). Communicate only with Bluetooth radios in close proximity.

Note: To achieve the best battery life turn off radios when not in use.

Enabling Bluetooth

Procedure:

Touch

Slide the Bluetooth switch to the ON position. The Bluetooth icon also appears in the Status bar.

62 | Bluetooth

February 2015 | MN000022A02-A