User's Guide

www.lm-technologies.com

LM074 SPP with GAP Central Application v1.1

5.1.4 LM074 requirements:

i. LM074 can be SPP master (initiate connection with remote device)

or SPP Slave (Accept connection request from remote device).

5.2 Firmware upgrade procedure Flow chart:

The flow chart below illustrates the firmware upgrade procedure, highlighting

messages when the upgrade operation is successful.

The comments show the failure points as FP1 to FP5.

The cause of failure points and actions to overcome them are discussed in the

subsequent section.

Note: During the upgrade procedure, after the module displays the message

“Ready to receive OTA file”, if the user fails to send the image to the LM074

module, the module/user cannot terminate the OTA mode. The user has to

provide power-on/off cycle to come out of OTA upgrade mode. Another way to

come out of this mode; the remote connected device has to send at-least 200

bytes of data. The module will treat this data as an upgrade image but due to

failure it will reboot itself with existing firmware.