Download MCU Update Files

The MCU can send this command to the module to initiate an update download. This OTA command differs from the OTA firmware update, which is initiated by the module.

Download MCU updates (Initiate) (0x1E)

The MCU sends the following data.

Example:

• The MCU sends the subcommand 0x00 to request the firmware update information:

  55 aa 00 1e 00xx 00 xxxxxxxxxxxxxxxx XX
  

• The MCU sends the subcommand 0x01 to resume a download:

  55 aa 00 1e 0001 01 XX
  

• The MCU sends the subcommand 0x02 to stop a download:

  55 aa 00 1e 0001 02 XX
  

The module returns the following data.

Example:

• The module returns 0x10 to indicate the firmware update information is obtained successfully:

  55 aa 00 1e 0001 10 XX
  

• The module returns 0x11 to indicate obtaining the firmware update information failed and the update download is stopped.

  55 aa 00 1e 0001 11 XX
  

Download MCU updates (Transfer) (0x1F)

The module sends the following data.

Example

Assume that the firmware update is 530 bytes and each packet is fixed to 256 bytes in size.

• The middle packet:

  55 AA 00 1f 01 04 00000000 xxx...xxx XX
  55 AA 00 1f 01 04 00000100 xxx...xxx XX
  

• For the last packet, the packet offset is 0x00000212, and the packet length is 0 bytes.

  55 AA 00 1f 00 04 00000212 XX
  

The MCU returns the following data.

Example

• The MCU responds to the middle packet:

  55 AA 00 1f 0000 0C          // The packet is received successfully.
  

• The MCU responds to the last packet:

  55 AA 00 1f 0001 00 0D     // CRC32 check succeeds.
  55 AA 00 1f 0001 01 0E     // CRC32 check fails.
  

Check file download progress (0xC3)

The MCU can send this command to request the progress of downloading the MCU updates or the NB-IoT updates.

The MCU sends the following data.

Example:

55 AA 00 C3 00 00 C2

The module returns the following data.

Example:

55 aa 00 c3 00 01 01 18 dc