User's Guide

www.lm-technologies.com

LM074 SPP with GAP Central Application v1.1

with “AT*PAIR=00126f357215, accept”, LM074 starts pairing

procedure.

ii. When the LM074 starts the pairing procedure with a remote

device and has IO-capability as Display only, LM074 shows the

Passkey for remote device as message “IND*:PASSKEY=311303”

here number 311303 is for reference only and should vary for

every device.

iii. IO-type as Display only indicates that the Passkey generated by

the Bluetooth stack for pairing is only displayed by the LM074.

iv. The user should ensure that the other device uses the passkey

provided by the LM074 module in above indication.

v. If the remote device uses the passkey displayed by the LM074

then the pairing procedure should be completed successfully.

vi. After the pairing procedure is completed, the LM074 indicates this

as “IND*:PAIR=OK,00126f357215” . 00126f357215 is the

reference BD address and LM074 will show the remote devices

BD-Address.

6.2.3 LM074 has settings DPIN=on, MITM=on, IO-

type=Display Y/N

i. After the LM074 indicates Pairing as “IND*:PAIR,00126f357215”

and the user accepts the pairing request with

“AT*PAIR=00126f357215, accept”, the LM074 starts the pairing

procedure.

ii. When the LM074 starts the Pairing procedure with the remote

device and has IO-capability as Display_YN i.e. Display passkey

and Confirmation is required as Yes or No, LM074 shows the

Passkey for remote device and expects the confirmation from user

as yes or No.

iii. The passkey is displayed by the LM074 module as

“IND*:PASSKEY=756830”.

iv. User shall provide confirmation with the AT command as

“at*passcfm=00126f357215,Yes” or

“at*passcfm=00126f357215,No”.

v. The remote device should be set as IO-type as display-only or

display-YN otherwise pairing will not be possible.

6.2.4 LM074 has settings DPIN=on, MITM=on, IO-type=no-

Input-no-output

i. Pairing with the remote device may or may not be successful and

depends on MITM and IO-type settings of remote device.

ii. If the remote device also has the same settings, then pairing may

be successful otherwise the pairing might fail.