LM Technologies LM400 At Command Manual page 24

2.10.2.1 Display Only
Host event "Passkey Dsp" with 6 digit passkey will be sent to host on serial interface if local
device or remote BT2.1 device has enabled MITM protection. The host must display passkey
(6 digit) and remote device user should confirm if displayed pass key is same as displayed on
remote BT2.1 device ("Display Yes or No") or same passkey entered by remote user on
remote BT2.1 device ("Keyboard only"). If remote BT2.1 device is "No Display no keypad" or
"Display only", pairing will be rejected and no message will be sent to host.
If MITM protection is disabled in local as well as remote BT2.1 device, automatic pairing (Just
Works) takes place irrespective of remote BT2.1 device type.
For example: On pairing request from mobile phone, the host will receive 6 digit passkey for
display purpose only. The mobile phone ("Display Yes or No") user will confirm if passkey
displayed on mobile is same as displayed on host. MITM protection must be enabled to
display passkey on host as well as prompt mobile phone user for confirmation.
2.10.2.2 Display with Yes or No
Message "Passkey Cfm" with 6 digit passkey will be sent to host if local or remote BT2.1
device has enabled MITM protection. The host must display passkey(6 digit) and prompt
local user to confirm if displayed passkey is same as displayed on remote BT2.1
device("Display Yes or No") or same passkey entered by remote person on remote BT2.1
device("Keyboard only"). The host should send "AT+PASSCFM" command for this
confirmation. If remote BT2.1 device is "No Display no keypad" or "Display only", pairing will
be rejected and no message will be sent to host.
If MITM protection is disabled in local as well as remote BT2.1 device, automatic pairing (Just
Works) takes place irrespective of remote BT2.1 device type.
For example: On pairing request from mobile phone, the host will receive 6 digit passkey for
display and local user will require to confirm if passkey displayed is same as displayed on
mobile("Display Yes or No"). Both host and mobile phone user will confirm the passkey
displayed on both sides. MITM protection must be enabled to display and confirm passkey
by both host as well as mobile phone user.
2.10.2.3 Keyboard Only
Message "Passkey Req" will be sent to host to request 6 digit passkey if local device or
remote BT2.1 device has enabled MITM protection. The host will prompt local user to enter
same passkey as displayed on remote BT2.1 device("Display Yes or No" or "Display only") or
same passkey entered by remote person on remote BT2.1 device("Keyboard only"). The
host should send "AT+PASSKEY" command for this confirmation. If remote BT2.1 device is
"No Display no keypad", pairing will be rejected and no message will be sent to host.
If MITM protection is disabled in local as well as remote BT2.1 device, automatic pairing (Just
Works) takes place irrespective of remote BT2.1 device type.
For example: On pairing request from mobile phone, the host must prompt local user to
enter same passkey which is displayed on mobile ("Display Yes or No"). The mobile phone
user will display the passkey entered by local user and prompt mobile phone user to confirm
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AT Command Manual
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