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att_db: implement read multiple variable request/response

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This commit is contained in:
Matthias Ringwald 2023-06-05 15:14:54 +02:00
parent 5683a8e461
commit 2c4384eb9a
1 changed files with 45 additions and 17 deletions
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62
src/ble/att_db.c
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@ -865,11 +865,12 @@ static uint16_t handle_read_blob_request(att_connection_t * att_connection, uint
//
// MARK: ATT_READ_MULTIPLE_REQUEST 0x0e
// MARK: ATT_READ_MULTIPLE_REQUEST 0x20
//
static uint16_t handle_read_multiple_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t num_handles, uint8_t * handles){
log_info("ATT_READ_MULTIPLE_REQUEST: num handles %u", num_handles);
uint8_t request_type = ATT_READ_MULTIPLE_REQUEST;
static uint16_t handle_read_multiple_request2(att_connection_t * att_connection, uint8_t * response_buffer, uint16_t response_buffer_size, uint16_t num_handles, uint8_t * handles, bool store_length){
log_info("ATT_READ_MULTIPLE_(VARIABLE_)REQUEST: num handles %u", num_handles);
uint8_t request_type = store_length ? ATT_READ_MULTIPLE_VARIABLE_REQ : ATT_READ_MULTIPLE_REQUEST;
uint8_t response_type = store_length ? ATT_READ_MULTIPLE_VARIABLE_RSP : ATT_READ_MULTIPLE_RESPONSE;
uint16_t offset = 1;
uint16_t i;
@ -882,11 +883,11 @@ static uint16_t handle_read_multiple_request2(att_connection_t * att_connection,
for (i=0; i<num_handles; i++){
handle = little_endian_read_16(handles, i << 1);
if (handle == 0u){
return setup_error_invalid_handle(response_buffer, request_type, handle);
}
att_iterator_t it;
int ok = att_find_handle(&it, handle);
@ -907,7 +908,7 @@ static uint16_t handle_read_multiple_request2(att_connection_t * att_connection,
}
att_update_value_len(&it, 0, att_connection->con_handle);
#ifdef ENABLE_ATT_DELAYED_RESPONSE
if (it.value_len == (uint16_t)ATT_READ_RESPONSE_PENDING) {
read_request_pending = true;
@ -923,28 +924,50 @@ static uint16_t handle_read_multiple_request2(att_connection_t * att_connection,
break;
}
// store
#ifdef ENABLE_GATT_OVER_EATT
// assert that at least Value Length can be stored
if (store_length && ((offset + 2) >= response_buffer_size)){
break;
}
// skip length field
uint16_t offset_value_length = offset;
if (store_length){
offset += 2;
}
#endif
// store data
uint16_t bytes_copied = att_copy_value(&it, 0, response_buffer + offset, response_buffer_size - offset, att_connection->con_handle);
offset += bytes_copied;
#ifdef ENABLE_GATT_OVER_EATT
// set length field
if (store_length) {
little_endian_store_16(response_buffer, offset_value_length, bytes_copied);
}
#endif
}
if (error_code != 0u){
return setup_error(response_buffer, request_type, handle, error_code);
}
response_buffer[0] = (uint8_t)ATT_READ_MULTIPLE_RESPONSE;
response_buffer[0] = (uint8_t)response_type;
return offset;
}
static uint16_t handle_read_multiple_request(att_connection_t * att_connection, uint8_t * request_buffer, uint16_t request_len,
uint8_t * response_buffer, uint16_t response_buffer_size){
static uint16_t
handle_read_multiple_request(att_connection_t *att_connection, uint8_t *request_buffer, uint16_t request_len,
uint8_t *response_buffer, uint16_t response_buffer_size, bool store_length) {
uint8_t request_type = store_length ? ATT_READ_MULTIPLE_VARIABLE_REQ : ATT_READ_MULTIPLE_REQUEST;
// 1 byte opcode + two or more attribute handles (2 bytes each)
if ( (request_len < 5u) || ((request_len & 1u) == 0u) ){
return setup_error_invalid_pdu(response_buffer, ATT_READ_MULTIPLE_REQUEST);
return setup_error_invalid_pdu(response_buffer, request_type);
}
int num_handles = (request_len - 1u) >> 1u;
return handle_read_multiple_request2(att_connection, response_buffer, response_buffer_size, num_handles, &request_buffer[1]);
uint8_t num_handles = (request_len - 1u) >> 1u;
return handle_read_multiple_request2(att_connection, response_buffer, response_buffer_size, num_handles,
&request_buffer[1], store_length);
}
//
@ -1331,9 +1354,14 @@ uint16_t att_handle_request(att_connection_t * att_connection,
response_len = handle_read_blob_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size);
break;
case ATT_READ_MULTIPLE_REQUEST:
response_len = handle_read_multiple_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size);
response_len = handle_read_multiple_request(att_connection, request_buffer, request_len, response_buffer,
response_buffer_size, false);
break;
case ATT_READ_BY_GROUP_TYPE_REQUEST:
case ATT_READ_MULTIPLE_VARIABLE_REQ:
response_len = handle_read_multiple_request(att_connection, request_buffer, request_len, response_buffer,
response_buffer_size, true);
break;
case ATT_READ_BY_GROUP_TYPE_REQUEST:
response_len = handle_read_by_group_type_request(att_connection, request_buffer, request_len, response_buffer, response_buffer_size);
break;
case ATT_WRITE_REQUEST: