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AN4486 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN4486 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 29 page  OTA bootloader service description AN4486 6/29 DocID026293 Rev 2 2 OTA bootloader service description The OTA bootloader service is addressed through the files btl.[ch] provided within the BlueNRG DK software which supports both BlueNRG and BlueNRG-MS devices. The following provides a brief description of the OTA bootloader service and related characteristics: Bootloader OTA service: the bootloader service aci_gatt_add_serv(UUID_TYPE_128, UUID, PRIMARY_SERVICE, 10, &btlServHandle) Btl Image characteristic: contains information related to the lower and higher bounds of free memory as suggested by the current application that includes the OTA bootloader service aci_gatt_add_char(btlServHandle, UUID_TYPE_128, UUID, 8, CHAR_PROP_READ, ATTR_PERMISSION_NONE, GATT_INTIMATE_APPL_WHEN_READ_N_WAIT,16, 0, &btlImageCharHandle) Btl new image characteristic: contains the base address and the size of the image that the master wants to send over-the-air aci_gatt_add_char(btlServHandle, UUID_TYPE_128, UUID, 9, CHAR_PROP_READ|CHAR_PROP_WRITE|CHAR_PROP_WRITE_WITHOUT_ RESP, ATTR_PERMISSION_NONE, GATT_INTIMATE_APPL_WHEN_READ_N_WAIT | GATT_SERVER_ATTR_WRITE,16, 0, &btlNewImageCharHandle) Btl new image content characteristic: contains a 16-byte block of firmware image data sent by the master (through a characteristic write command) along with some control information such as block sequence number (2 bytes) and checksum for integrity check (1 byte) aci_gatt_add_char(btlServHandle, UUID_TYPE_128, UUID, 20, CHAR_PROP_READ|CHAR_PROP_WRITE|CHAR_PROP_WRITE_WITHOUT_ RESP, ATTR_PERMISSION_NONE, GATT_INTIMATE_APPL_WHEN_READ_N_WAIT | GATT_SERVER_ATTR_WRITE,16, 0, &btlNewImageTUContentCharHandle) Btl expected image sequence number characteristic, through which the slave device notifies the master about the next block it expects aci_gatt_add_char(btlServHandle, UUID_TYPE_128, UUID, 4, CHAR_PROP_NOTIFY|CHAR_PROP_READ, ATTR_PERMISSION_NONE, GATT_INTIMATE_APPL_WHEN_READ_N_WAIT, 16, 0, &btlExpectedImageTUSeqNumberCharHandle) Note: OTA bootloader service and proprietary 128-bit UUID characteristics are defined within the file btl.c. 2.1 Bootloading transactions This section walks through the steps for OTA bootloading: 1. Once the master and slave running the OTA bootloader service are set, a discovery procedure needs to be done in order for the two devices to connect. Discovery is achieved by listening to advertisements coming from devices within the radio range (active scan) and selecting the ones containing the OTA BTL service UUID 128-bits within the scan response. 2. The name of the selected device will be read from the advertising message to be utilized by the master in order to enhance the slave identification procedure. |
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