User's Guide

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LM074 SPP with GAP Central Application v1.1

Figure 2: UART messages when the module is not connected to the peer device

5.3.4 Failure point 4:

i. After the module shows the message “Ready to receive OTA file”,

it is ready to receive the upgrade image.

ii. After the peer device begins sending the file, the module opens

internal memory partition2 or partition3 to write this image

iii. The message “PTN2”/”PTN3” indicates that the module is writing

the file to partition2/partition3.

iv. This message should appear one or two seconds after the peer

starts sending the file.

v. If the module does not show this message, but the peer device

indicates that the file has been sent, an error has occurred.

vi. In this case the user should power the module on and off or reset

the module with the “AT*reset=1” command and try the

procedure from start again.

vii. Refer to the image below