Further Information For A Secure Connection Setup; Just Works Mode - We PROTEUS-III User Manual

WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-III
As soon as one module closes the connection using a CMD_DISCONNECT_REQ , both devices will
inform their host by a CMD_DISCONNECT_IND message that the connection is no longer open. If
a device is no longer within range, the CMD_DISCONNECT_IND message is triggered by a timeout.
An example of setting up an unsecured connection is shown in chapter 4.4 . How to setup a se-
cured connection is shown in the preceding chapters. See also the application note "ANR009
advanced developer guide" to get detailed information about the connection setup with foreign
devices.

5.6.1. Further information for a secure connection setup

The RF_SecFlags parameter of the module determines the security mode. If a certain security
mode of a Proteus-III peripheral device is set, its security level has to be met by the connecting
central device to be able to exchange data. As long as the defined security level is not met by
the central device, no access to the peripheral's profiles will be granted.
When connecting from a Proteus-III to another Proteus radio module, you shall
not use different security modes.
To get further information about the secured connection setup, when using
a foreign device (i.e. mobile phone with a custom APP), please refer to the
Proteus-III application note "ANR009 advanced developer guide".

5.6.1.1. Just works mode

In case of the "Just works" mode, each time a connection is established, a new random key
is exchanged in advance to be used for data encryption. Since no authentication will be per-
formed, also devices without input and output capabilities (like keyboard or display) are able to
connect to each other.
Example: Secured connection with LE Legacy security method "Just Works" without
bonding
1. Power-up the modules and make their UARTs accessible by the host(s) (115200 Baud,
8n1). After the power-up or after reset the following sequence is sent from the module to
the host.
Info
Response CMD_GETSTATE_CNF : Module A
started in ACTION_IDLE mode.
Response CMD_GETSTATE_CNF : Module B
started in ACTION_IDLE mode.
Order code 2611011024000
Version 1.8 , July 2022
Module A
02 41 02 00 01 01 41
www.we-online.com/wcs
Module B
02 41 02 00 01 01 41
38