My app uses a proprietary service and characteristic UUIDs; the app needs to completely manage all characteristic reads and writes. With nRF Connect, I can see my service and characteristics. I can even read all my characteristics, but data received is not the data that I provide to sd_ble_gatts_rw_authorize_reply(). I have verified with a sniffer that the nRF ATT_READ_RSP always contains the same data, which is not the data I provided to sd_ble_gatts_rw_authorize_reply(). What am I doing wrong?
sd_ble_gatts_characteristic_add() is set up like this:
// characteristic metadata
memset(&char_md, 0, sizeof(char_md)); // defaults all 0 and NULL
char_md.char_props.read = 1;
char_md.char_props.write = 1;
// attribute metadata
memset(&attr_md, 0, sizeof(attr_md));
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.read_perm); // no security requirement to read
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm); // no security requirement to write
attr_md.vloc = BLE_GATTS_VLOC_USER;
attr_md.rd_auth = 1; // we want to be called back on every read
attr_md.wr_auth = 0;
attr_md.vlen = 0;
memset(&attr_char_value, 0, sizeof(attr_char_value));
ble_uuid.type = myUuidType
ble_uuid.uuid = myUuid16;
attr_char_value.p_uuid = &ble_uuid;
attr_char_value.p_attr_md = &attr_md;
attr_char_value.init_len = 20;
attr_char_value.init_offs = 0;
attr_char_value.max_len = 20;
attr_char_value.p_value = NULL;
sd_ble_gatts_characteristic_add(...)
When I receive the BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST event with (req.type == BLE_GATTS_AUTHORIZE_TYPE_READ), I provide the attribute data like this:
static uint8_t sendBuf[30];
ble_gatts_rw_authorize_reply_params_t rdReply;
rdReply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
rdReply.params.read.offset = 0;
rdReply.params.read.update = 1; // tried 0 as well, made no difference
returnLength = getCharValue(sendbuf); // puts attribute data into sendbuf
rdReply.params.read.len = returnLength;
rdReply.params.read.p_data = sendBuf;
err_code = sd_ble_gatts_rw_authorize_reply(conHandle, &rdReply);
APP_ERROR_CHECK(err_code);
What am I doing wrong?
