error: invalid length in advertising init

[sruthiraj koodathil]

hii...

i hv maufature_array of size 7 to advertise.... am facing a problem while advertising battery level service with dat... my code is lyk dis

 uint32_t      err_code;
 uint8_t       flags =BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
 ble_advdata_t              advdata1;
 ble_advdata_service_data_t service_data[1];
ble_advdata_manuf_data_t   manuf_specific_data;
uint8_t                    manuf_data_array[6];	

manuf_data_array[0] = 0x01;
manuf_data_array[1] = 0x02;
manuf_data_array[2] = 0x03;
manuf_data_array[3] =0x04;
manuf_data_array[4] = 0x05;
manuf_data_array[5] = 0x06;

manuf_specific_data.company_identifier = COMPANY_IDENTIFER;  /* COMPANY IDENTIFIER */
manuf_specific_data.data.p_data = manuf_data_array;
manuf_specific_data.data.size = sizeof(manuf_data_array);

uint8_t battery              = do_battery_measurement();
service_data[0].service_uuid = BLE_UUID_BATTERY_SERVICE;
service_data[0].data.p_data  = &battery;
service_data[0].data.size    = sizeof(battery);


// Build and set advertising data
memset(&advdata1, 0, sizeof(advdata1));

advdata1.name_type               = BLE_ADVDATA_FULL_NAME;
advdata1.flags.size              = sizeof(flags);
advdata1.flags.p_data            = &flags;
advdata1.p_service_data_array    = service_data;
advdata1.service_data_count      = 1;
advdata1.p_manuf_specific_data   = &manuf_specific_data;

err_code = ble_advdata_set(&advdata1, NULL);
APP_ERROR_CHECK(err_code);

[Vebjørn]

I'm guessing it's sd_ble_gap_adv_data_set that is throwing the NRF_ERROR_INVALID_LENGTH? I would perhaps try printing both dlen and srdlen before the call to this function to see what they are

[scytulip]

A BLE advertising packet contains at most 31 bytes data. You can try putting some data into the scan response, another 31bytes packet. For instance,

uint32_t      err_code;
ble_advdata_t advdata;
ble_advdata_t scanrsp;

uint8_t       flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

ble_uuid_t adv_uuids[] =
{
    {BLE_UUID_BATTERY_SERVICE,                  BLE_UUID_TYPE_BLE},
    {BLE_UUID_HEART_RATE_SERVICE,               BLE_UUID_TYPE_BLE},
    {BLE_UUID_DEVICE_INFORMATION_SERVICE,       BLE_UUID_TYPE_BLE},
    {BLE_UUID_NUS_SERVICE,                      m_nus.uuid_type}
}; // Too long to fit all in advdata

// Build and set advertising data
memset(&advdata, 0, sizeof(advdata));
memset(&scanrsp, 0, sizeof(scanrsp));

advdata.name_type               = BLE_ADVDATA_FULL_NAME;
advdata.include_appearance      = true;
advdata.flags.size              = sizeof(flags);
advdata.flags.p_data            = &flags;
scanrsp.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
scanrsp.uuids_complete.p_uuids  = adv_uuids;

err_code = ble_advdata_set(&advdata, &scanrsp);
APP_ERROR_CHECK(err_code);

[sruthiraj koodathil]

but i want to advertise battery level as a service....

[Petter Myhre]

As @scytulip says, you cannot have more than 31 bytes of data in the advertising packets. He has given you a solution, to use scan request and scan response to obtain additional data.

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