HI, while learning how to use IDB05A1 shield with nucleo n053r8 I've stumbled over a problem. I've modified SensorDemo_BLESensor-App (from package X-CUBE-BLE 1.4.40) code to create my own server with 2 characteristics:
/**
* @brief Add the SW Feature service using a vendor specific profile
* @param None
* @retval tBleStatus Status
*/
tBleStatus Add_RX_TX_service(void)
{
tBleStatus ret;
int32_t NumberOfRecords=1;
uint8_t uuid[16];
COPY_NOYAK_SERVICE_UUID(uuid);
BLUENRG_memcpy(&service_uuid.Service_UUID_128, uuid, 16);
ret = aci_gatt_add_serv(
UUID_TYPE_128,
service_uuid.Service_UUID_128,
PRIMARY_SERVICE,
6, // liczba rekordow (3 * liczba charakterystyk ?)
&RXTX_Service_handle);
if (ret != BLE_STATUS_SUCCESS) {
goto fail;
}
COPY_TX_UUID(uuid);
BLUENRG_memcpy(&char_uuid.Char_UUID_128, uuid, 16);
ret = aci_gatt_add_char(
RXTX_Service_handle,
UUID_TYPE_128, char_uuid.Char_UUID_128,
20,
CHAR_PROP_READ,
ATTR_PERMISSION_NONE | CHAR_PROP_NOTIFY,
GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP,
20,
0,
&TX_handle);
if (ret != BLE_STATUS_SUCCESS) {
goto fail;
}
PRINTF("TX characteristick initialized\n");
COPY_RX_UUID(uuid);
BLUENRG_memcpy(&char_uuid.Char_UUID_128, uuid, 16);
ret = aci_gatt_add_char(
RXTX_Service_handle,
UUID_TYPE_128, char_uuid.Char_UUID_128,
20,
CHAR_PROP_WRITE | CHAR_PROP_WRITE_WITHOUT_RESP,
ATTR_PERMISSION_NONE,
GATT_NOTIFY_ATTRIBUTE_WRITE,
20,
1,
&RX_handle);
if (ret != BLE_STATUS_SUCCESS) {
PRINTF("ret error: %02X", ret);
goto fail;
}
PRINTF("RX characteristick initialized\n");
return BLE_STATUS_SUCCESS;
fail:
return BLE_STATUS_ERROR;
}
And that works fine.
Next, I've started working on RX characteristic - first simple task was to print everything received from the PC to uart debug console:
Event callback:
/**
* @brief Callback processing the ACI events.
* @note Inside this function each event must be identified and correctly
* parsed.
* @param void* Pointer to the ACI packet
* @retval None
*/
void user_notify(void * pData)
{
hci_uart_pckt *hci_pckt = pData;
/* obtain event packet */
hci_event_pckt *event_pckt = (hci_event_pckt*)hci_pckt->data;
if(hci_pckt->type != HCI_EVENT_PKT)
return;
PRINTF("HCI EVENT: 0x%02X\n", event_pckt->evt);
switch(event_pckt->evt){
case EVT_DISCONN_COMPLETE:
{
GAP_DisconnectionComplete_CB();
}
break;
case EVT_LE_META_EVENT:
{
evt_le_meta_event *evt = (void *)event_pckt->data;
switch(evt->subevent){
case EVT_LE_CONN_COMPLETE:
{
evt_le_connection_complete *cc = (void *)evt->data;
GAP_ConnectionComplete_CB(cc->peer_bdaddr, cc->handle);
}
break;
}
}
break;
case EVT_VENDOR:
{
evt_blue_aci *blue_evt = (void*)event_pckt->data;
PRINTF("event code 0x%04X\n", blue_evt->ecode);
switch(blue_evt->ecode){
case EVT_BLUE_GATT_READ_PERMIT_REQ:
{
PRINTF("EVENT notify");
evt_gatt_read_permit_req *pr = (void*)blue_evt->data;
Read_Request_CB(pr->attr_handle);
}
break;
/*********************** MY CODE ***********************/
case EVT_BLUE_GATT_ATTRIBUTE_MODIFIED:
{
evt_gatt_attr_modified_IDB05A1 *event = (evt_gatt_attr_modified_IDB05A1*)event_pckt->data;
PRINTF("connection handle: %04X\n"
"attribute handle : %04X\n"
"data lenth : : %02X\n"
"offset : %04X\n",
event->conn_handle,
event->attr_handle,
event->data_length,
event->offset);
PRINTF("RX <-");
for(int i=0; i< event->data_length + 6; i++){
PRINTF(" %02X", event->att_data[i]);
}
PRINTF("\n");
break;
}
/***********************end of MY CODE ***********************/
}
}
break;
}
}
problems: :
- this code always prints '00 00' prefix before the proper data
- event->data_length is always 16 (0x10)
- event->offset - contains real length of the data sent from the PC (eg. for 0xdeadbeef its 4, for 0xdeadbeefdeadbeef its 8, and for 20 bytes its 20)
- in order to read 20 bytes of data sent from the PC i have to read buffer starting from event->att_data[2] to event->att_data[22]
- event->offset contains data with bytes reversed : 0x0400 means 4 , and 0x1400 means 20.
I use GNU Arm Embedded Toolchain on windows 10 with makefile generated from CubeMx for compiling my source code. CubeMX project attached.
Can someone confirm if all those things are bugs to be reported
