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ATT.cpp
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/*
This file is part of the ArduinoBLE library.
Copyright (c) 2018 Arduino SA. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <Arduino.h>
#include "HCI.h"
#include "GATT.h"
#include "local/BLELocalAttribute.h"
#include "local/BLELocalCharacteristic.h"
#include "local/BLELocalDescriptor.h"
#include "local/BLELocalService.h"
#include "remote/BLERemoteDevice.h"
#include "remote/BLERemoteService.h"
#include "BLEProperty.h"
#include "ATT.h"
#define ATT_OP_ERROR 0x01
#define ATT_OP_MTU_REQ 0x02
#define ATT_OP_MTU_RESP 0x03
#define ATT_OP_FIND_INFO_REQ 0x04
#define ATT_OP_FIND_INFO_RESP 0x05
#define ATT_OP_FIND_BY_TYPE_REQ 0x06
#define ATT_OP_FIND_BY_TYPE_RESP 0x07
#define ATT_OP_READ_BY_TYPE_REQ 0x08
#define ATT_OP_READ_BY_TYPE_RESP 0x09
#define ATT_OP_READ_REQ 0x0a
#define ATT_OP_READ_RESP 0x0b
#define ATT_OP_READ_BLOB_REQ 0x0c
#define ATT_OP_READ_BLOB_RESP 0x0d
#define ATT_OP_READ_MULTI_REQ 0x0e
#define ATT_OP_READ_MULTI_RESP 0x0f
#define ATT_OP_READ_BY_GROUP_REQ 0x10
#define ATT_OP_READ_BY_GROUP_RESP 0x11
#define ATT_OP_WRITE_REQ 0x12
#define ATT_OP_WRITE_RESP 0x13
#define ATT_OP_WRITE_CMD 0x52
#define ATT_OP_PREP_WRITE_REQ 0x16
#define ATT_OP_PREP_WRITE_RESP 0x17
#define ATT_OP_EXEC_WRITE_REQ 0x18
#define ATT_OP_EXEC_WRITE_RESP 0x19
#define ATT_OP_HANDLE_NOTIFY 0x1b
#define ATT_OP_HANDLE_IND 0x1d
#define ATT_OP_HANDLE_CNF 0x1e
#define ATT_OP_SIGNED_WRITE_CMD 0xd2
#define ATT_ECODE_INVALID_HANDLE 0x01
#define ATT_ECODE_READ_NOT_PERM 0x02
#define ATT_ECODE_WRITE_NOT_PERM 0x03
#define ATT_ECODE_INVALID_PDU 0x04
#define ATT_ECODE_AUTHENTICATION 0x05
#define ATT_ECODE_REQ_NOT_SUPP 0x06
#define ATT_ECODE_INVALID_OFFSET 0x07
#define ATT_ECODE_AUTHORIZATION 0x08
#define ATT_ECODE_PREP_QUEUE_FULL 0x09
#define ATT_ECODE_ATTR_NOT_FOUND 0x0a
#define ATT_ECODE_ATTR_NOT_LONG 0x0b
#define ATT_ECODE_INSUFF_ENCR_KEY_SIZE 0x0c
#define ATT_ECODE_INVAL_ATTR_VALUE_LEN 0x0d
#define ATT_ECODE_UNLIKELY 0x0e
#define ATT_ECODE_INSUFF_ENC 0x0f
#define ATT_ECODE_UNSUPP_GRP_TYPE 0x10
#define ATT_ECODE_INSUFF_RESOURCES 0x11
ATTClass::ATTClass() :
_maxMtu(23),
_timeout(5000),
_longWriteHandle(0x0000),
_longWriteValue(NULL),
_longWriteValueLength(0)
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
_peers[i].connectionHandle = 0xffff;
_peers[i].role = 0x00;
_peers[i].addressType = 0x00;
memset(_peers[i].address, 0x00, sizeof(_peers[i].address));
_peers[i].mtu = 23;
_peers[i].device = NULL;
}
memset(_eventHandlers, 0x00, sizeof(_eventHandlers));
}
ATTClass::~ATTClass()
{
if (_longWriteValue) {
free(_longWriteValue);
}
}
bool ATTClass::connect(uint8_t peerBdaddrType, uint8_t peerBdaddr[6])
{
if (HCI.leCreateConn(0x0060, 0x0030, 0x00, peerBdaddrType, peerBdaddr, 0x00,
0x0006, 0x000c, 0x0000, 0x00c8, 0x0004, 0x0006) != 0) {
return false;
}
bool isConnected = false;
for (unsigned long start = millis(); (millis() - start) < _timeout;) {
HCI.poll();
isConnected = connected(peerBdaddrType, peerBdaddr);
if (isConnected) {
break;
}
}
if (!isConnected) {
HCI.leCancelConn();
}
return isConnected;
}
bool ATTClass::disconnect(uint8_t peerBdaddrType, uint8_t peerBdaddr[6])
{
uint16_t connHandle = connectionHandle(peerBdaddrType, peerBdaddr);
if (connHandle == 0xffff) {
return false;
}
HCI.disconnect(connHandle);
for (unsigned long start = millis(); (millis() - start) < _timeout;) {
HCI.poll();
if (!connected(connHandle)) {
return true;
}
}
return false;
}
bool ATTClass::discoverAttributes(uint8_t peerBdaddrType, uint8_t peerBdaddr[6], const char* serviceUuidFilter)
{
uint16_t connHandle = connectionHandle(peerBdaddrType, peerBdaddr);
if (connHandle == 0xffff) {
return false;
}
// send MTU request
if (!exchangeMtu(connHandle)) {
return false;
}
// find the device entry for the peeer
BLERemoteDevice* device = NULL;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == connHandle) {
if (_peers[i].device == NULL) {
_peers[i].device = new BLERemoteDevice();
}
device = _peers[i].device;
break;
}
}
if (device == NULL) {
return false;
}
if (serviceUuidFilter == NULL) {
// clear existing services
device->clearServices();
} else {
int serviceCount = device->serviceCount();
for (int i = 0; i < serviceCount; i++) {
BLERemoteService* service = device->service(i);
if (strcasecmp(service->uuid(), serviceUuidFilter) == 0) {
// found an existing service with same UUID
return true;
}
}
}
// discover services
if (!discoverServices(connHandle, device, serviceUuidFilter)) {
return false;
}
// discover characteristics
if (!discoverCharacteristics(connHandle, device)) {
return false;
}
// discover descriptors
if (!discoverDescriptors(connHandle, device)) {
return false;
}
return true;
}
void ATTClass::setMaxMtu(uint16_t maxMtu)
{
_maxMtu = maxMtu;
}
void ATTClass::setTimeout(unsigned long timeout)
{
_timeout = timeout;
}
void ATTClass::addConnection(uint16_t handle, uint8_t role, uint8_t peerBdaddrType,
uint8_t peerBdaddr[6], uint16_t /*interval*/,
uint16_t /*latency*/, uint16_t /*supervisionTimeout*/,
uint8_t /*masterClockAccuracy*/)
{
int peerIndex = -1;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == 0xffff) {
peerIndex = i;
break;
}
}
if (peerIndex == -1) {
// bail, no space
return;
}
_peers[peerIndex].connectionHandle = handle;
_peers[peerIndex].role = role;
_peers[peerIndex].mtu = 23;
_peers[peerIndex].addressType = peerBdaddrType;
memcpy(_peers[peerIndex].address, peerBdaddr, sizeof(_peers[peerIndex].address));
if (_eventHandlers[BLEConnected]) {
_eventHandlers[BLEConnected](BLEDevice(peerBdaddrType, peerBdaddr));
}
}
void ATTClass::handleData(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
uint8_t opcode = data[0];
dlen--;
data++;
uint16_t mtu = this->mtu(connectionHandle);
switch (opcode) {
case ATT_OP_ERROR:
error(connectionHandle, dlen, data);
break;
case ATT_OP_MTU_REQ:
mtuReq(connectionHandle, dlen, data);
break;
case ATT_OP_MTU_RESP:
mtuResp(connectionHandle, dlen, data);
break;
case ATT_OP_FIND_INFO_REQ:
findInfoReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_FIND_INFO_RESP:
findInfoResp(connectionHandle, dlen, data);
break;
case ATT_OP_FIND_BY_TYPE_REQ:
findByTypeReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_READ_BY_TYPE_REQ:
readByTypeReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_READ_BY_TYPE_RESP:
readByTypeResp(connectionHandle, dlen, data);
break;
case ATT_OP_READ_BY_GROUP_REQ:
readByGroupReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_READ_BY_GROUP_RESP:
readByGroupResp(connectionHandle, dlen, data);
break;
case ATT_OP_READ_REQ:
case ATT_OP_READ_BLOB_REQ:
readOrReadBlobReq(connectionHandle, mtu, opcode, dlen, data);
break;
case ATT_OP_READ_RESP:
readResp(connectionHandle, dlen, data);
break;
case ATT_OP_WRITE_REQ:
case ATT_OP_WRITE_CMD:
writeReqOrCmd(connectionHandle, mtu, opcode, dlen, data);
break;
case ATT_OP_WRITE_RESP:
writeResp(connectionHandle, dlen, data);
break;
case ATT_OP_PREP_WRITE_REQ:
prepWriteReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_EXEC_WRITE_REQ:
execWriteReq(connectionHandle, mtu, dlen, data);
break;
case ATT_OP_HANDLE_NOTIFY:
case ATT_OP_HANDLE_IND:
handleNotifyOrInd(connectionHandle, opcode, dlen, data);
break;
case ATT_OP_HANDLE_CNF:
handleCnf(connectionHandle, dlen, data);
break;
case ATT_OP_READ_MULTI_REQ:
case ATT_OP_SIGNED_WRITE_CMD:
default:
sendError(connectionHandle, opcode, 0x00, ATT_ECODE_REQ_NOT_SUPP);
break;
}
}
void ATTClass::removeConnection(uint16_t handle, uint8_t /*reason*/)
{
int peerIndex = -1;
int peerCount = 0;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == handle) {
peerIndex = i;
}
if (_peers[i].connectionHandle != 0xffff) {
peerCount++;
}
}
if (peerIndex == -1) {
// bail not found
return;
}
BLEDevice bleDevice(_peers[peerIndex].addressType, _peers[peerIndex].address);
if (peerCount == 1) {
// clear CCCD values on disconnect
for (uint16_t i = 0; i < GATT.attributeCount(); i++) {
BLELocalAttribute* attribute = GATT.attribute(i);
if (attribute->type() == BLETypeCharacteristic) {
BLELocalCharacteristic* characteristic = (BLELocalCharacteristic*)attribute;
characteristic->writeCccdValue(bleDevice, 0x0000);
}
}
_longWriteHandle = 0x0000;
_longWriteValueLength = 0;
}
if (_eventHandlers[BLEDisconnected]) {
_eventHandlers[BLEDisconnected](bleDevice);
}
_peers[peerIndex].connectionHandle = 0xffff;
_peers[peerIndex].role = 0x00;
_peers[peerIndex].addressType = 0x00;
memset(_peers[peerIndex].address, 0x00, sizeof(_peers[peerIndex].address));
_peers[peerIndex].mtu = 23;
if (_peers[peerIndex].device) {
delete _peers[peerIndex].device;
}
_peers[peerIndex].device = NULL;
}
uint16_t ATTClass::connectionHandle(uint8_t addressType, const uint8_t address[6]) const
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].addressType == addressType && memcmp(_peers[i].address, address, 6) == 0) {
return _peers[i].connectionHandle;
}
}
return 0xffff;
}
BLERemoteDevice* ATTClass::device(uint8_t addressType, const uint8_t address[6]) const
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].addressType == addressType && memcmp(_peers[i].address, address, 6) == 0) {
return _peers[i].device;
}
}
return NULL;
}
bool ATTClass::connected() const
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle != 0xffff) {
return true;
}
}
return false;
}
bool ATTClass::connected(uint8_t addressType, const uint8_t address[6]) const
{
return (connectionHandle(addressType, address) != 0xffff);
}
bool ATTClass::connected(uint16_t handle) const
{
HCI.poll();
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == handle) {
return true;
}
}
return false;
}
uint16_t ATTClass::mtu(uint16_t handle) const
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == handle) {
return _peers[i].mtu;
}
}
return 23;
}
bool ATTClass::disconnect()
{
int numDisconnects = 0;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == 0xffff) {
continue;
}
if (HCI.disconnect(_peers[i].connectionHandle) != 0) {
continue;
}
numDisconnects++;
_peers[i].connectionHandle = 0xffff;
_peers[i].role = 0x00;
_peers[i].addressType = 0x00;
memset(_peers[i].address, 0x00, sizeof(_peers[i].address));
_peers[i].mtu = 23;
if (_peers[i].device) {
delete _peers[i].device;
}
_peers[i].device = NULL;
}
return (numDisconnects > 0);
}
BLEDevice ATTClass::central()
{
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == 0xffff || _peers[i].role != 0x01) {
continue;
}
return BLEDevice(_peers[i].addressType, _peers[i].address);
}
return BLEDevice();
}
bool ATTClass::handleNotify(uint16_t handle, const uint8_t* value, int length)
{
int numNotifications = 0;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == 0xffff) {
continue;
}
uint8_t notication[_peers[i].mtu];
uint16_t noticationLength = 0;
notication[0] = ATT_OP_HANDLE_NOTIFY;
noticationLength++;
memcpy(¬ication[1], &handle, sizeof(handle));
noticationLength += sizeof(handle);
length = min((uint16_t)(_peers[i].mtu - noticationLength), (uint16_t)length);
memcpy(¬ication[noticationLength], value, length);
noticationLength += length;
HCI.sendAclPkt(_peers[i].connectionHandle, ATT_CID, noticationLength, notication);
numNotifications++;
}
return (numNotifications > 0);
}
bool ATTClass::handleInd(uint16_t handle, const uint8_t* value, int length)
{
int numIndications = 0;
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == 0xffff) {
continue;
}
uint8_t indication[_peers[i].mtu];
uint16_t indicationLength = 0;
indication[0] = ATT_OP_HANDLE_IND;
indicationLength++;
memcpy(&indication[1], &handle, sizeof(handle));
indicationLength += sizeof(handle);
length = min((uint16_t)(_peers[i].mtu - indicationLength), (uint16_t)length);
memcpy(&indication[indicationLength], value, length);
indicationLength += length;
_cnf = false;
HCI.sendAclPkt(_peers[i].connectionHandle, ATT_CID, indicationLength, indication);
while (!_cnf) {
HCI.poll();
if (!connected(_peers[i].addressType, _peers[i].address)) {
break;
}
}
numIndications++;
}
return (numIndications > 0);
}
void ATTClass::error(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
if (dlen != 4) {
// drop
return;
}
struct __attribute__ ((packed)) AttError {
uint8_t opcode;
uint16_t handle;
uint8_t code;
} *attError = (AttError*)data;
if (_pendingResp.connectionHandle == connectionHandle && (_pendingResp.op - 1) == attError->opcode) {
_pendingResp.buffer[0] = ATT_OP_ERROR;
memcpy(&_pendingResp.buffer[1], data, dlen);
_pendingResp.length = dlen + 1;
}
}
void ATTClass::mtuReq(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
uint16_t mtu = *(uint16_t*)data;
if (dlen != 2) {
sendError(connectionHandle, ATT_OP_MTU_REQ, 0x0000, ATT_ECODE_INVALID_PDU);
return;
}
if (mtu > _maxMtu) {
mtu = _maxMtu;
}
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == connectionHandle) {
_peers[i].mtu = mtu;
break;
}
}
struct __attribute__ ((packed)) {
uint8_t op;
uint16_t mtu;
} mtuResp = { ATT_OP_MTU_RESP, mtu };
HCI.sendAclPkt(connectionHandle, ATT_CID, sizeof(mtuResp), &mtuResp);
}
int ATTClass::mtuReq(uint16_t connectionHandle, uint16_t mtu, uint8_t responseBuffer[])
{
struct __attribute__ ((packed)) {
uint8_t op;
uint16_t mtu;
} mtuReq = { ATT_OP_MTU_REQ, mtu };
return sendReq(connectionHandle, &mtuReq, sizeof(mtuReq), responseBuffer);
}
void ATTClass::mtuResp(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
uint16_t mtu = *(uint16_t*)data;
if (dlen != 2) {
return;
}
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == connectionHandle) {
_peers[i].mtu = mtu;
break;
}
}
if (connectionHandle == _pendingResp.connectionHandle && _pendingResp.op == ATT_OP_MTU_RESP) {
_pendingResp.buffer[0] = ATT_OP_MTU_RESP;
memcpy(&_pendingResp.buffer[1], data, dlen);
_pendingResp.length = dlen + 1;
}
}
void ATTClass::findInfoReq(uint16_t connectionHandle, uint16_t mtu, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) FindInfoReq {
uint16_t startHandle;
uint16_t endHandle;
} *findInfoReq = (FindInfoReq*)data;
if (dlen != sizeof(FindInfoReq)) {
sendError(connectionHandle, ATT_OP_FIND_INFO_REQ, findInfoReq->startHandle, ATT_ECODE_INVALID_PDU);
return;
}
uint8_t response[mtu];
uint16_t responseLength;
response[0] = ATT_OP_FIND_INFO_RESP;
response[1] = 0x00;
responseLength = 2;
for (uint16_t i = (findInfoReq->startHandle - 1); i < GATT.attributeCount() && i <= (findInfoReq->endHandle - 1); i++) {
BLELocalAttribute* attribute = GATT.attribute(i);
uint16_t handle = (i + 1);
bool isValueHandle = (attribute->type() == BLETypeCharacteristic) && (((BLELocalCharacteristic*)attribute)->valueHandle() == handle);
int uuidLen = isValueHandle ? 2 : attribute->uuidLength();
int infoType = (uuidLen == 2) ? 0x01 : 0x02;
if (response[1] == 0) {
response[1] = infoType;
}
if (response[1] != infoType) {
// different type
break;
}
// add the handle
memcpy(&response[responseLength], &handle, sizeof(handle));
responseLength += sizeof(handle);
if (isValueHandle || attribute->type() == BLETypeDescriptor) {
// add the UUID
memcpy(&response[responseLength], attribute->uuidData(), uuidLen);
responseLength += uuidLen;
} else {
// add the type
uint16_t type = attribute->type();
memcpy(&response[responseLength], &type, sizeof(type));
responseLength += sizeof(type);
}
if ((responseLength + (2 + uuidLen)) > mtu) {
break;
}
}
if (responseLength == 2) {
sendError(connectionHandle, ATT_OP_FIND_INFO_REQ, findInfoReq->startHandle, ATT_ECODE_ATTR_NOT_FOUND);
} else {
HCI.sendAclPkt(connectionHandle, ATT_CID, responseLength, response);
}
}
int ATTClass::findInfoReq(uint16_t connectionHandle, uint16_t startHandle, uint16_t endHandle, uint8_t responseBuffer[])
{
struct __attribute__ ((packed)) {
uint8_t op;
uint16_t startHandle;
uint16_t endHandle;
} findInfoReq = { ATT_OP_FIND_INFO_REQ, startHandle, endHandle };
return sendReq(connectionHandle, &findInfoReq, sizeof(findInfoReq), responseBuffer);
}
void ATTClass::findInfoResp(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
if (dlen < 2) {
return; // invalid, drop
}
if (connectionHandle == _pendingResp.connectionHandle && _pendingResp.op == ATT_OP_FIND_INFO_RESP) {
_pendingResp.buffer[0] = ATT_OP_FIND_INFO_RESP;
memcpy(&_pendingResp.buffer[1], data, dlen);
_pendingResp.length = dlen + 1;
}
}
void ATTClass::findByTypeReq(uint16_t connectionHandle, uint16_t mtu, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) FindByTypeReq {
uint16_t startHandle;
uint16_t endHandle;
uint16_t type;
} *findByTypeReq = (FindByTypeReq*)data;
if (dlen < sizeof(FindByTypeReq)) {
sendError(connectionHandle, ATT_OP_FIND_BY_TYPE_RESP, findByTypeReq->startHandle, ATT_ECODE_INVALID_PDU);
return;
}
uint16_t valueLength = dlen - sizeof(*findByTypeReq);
uint8_t* value = &data[sizeof(*findByTypeReq)];
uint8_t response[mtu];
uint16_t responseLength;
response[0] = ATT_OP_FIND_BY_TYPE_RESP;
responseLength = 1;
if (findByTypeReq->type == BLETypeService) {
for (uint16_t i = (findByTypeReq->startHandle - 1); i < GATT.attributeCount() && i <= (findByTypeReq->endHandle - 1); i++) {
BLELocalAttribute* attribute = GATT.attribute(i);
if ((attribute->type() == findByTypeReq->type) && (attribute->uuidLength() == valueLength) && memcmp(attribute->uuidData(), value, valueLength) == 0) {
BLELocalService* service = (BLELocalService*)attribute;
// add the start handle
uint16_t startHandle = service->startHandle();
memcpy(&response[responseLength], &startHandle, sizeof(startHandle));
responseLength += sizeof(startHandle);
// add the end handle
uint16_t endHandle = service->endHandle();
memcpy(&response[responseLength], &endHandle, sizeof(endHandle));
responseLength += sizeof(endHandle);
}
if ((responseLength + 4) > mtu) {
break;
}
}
}
if (responseLength == 1) {
sendError(connectionHandle, ATT_OP_FIND_BY_TYPE_RESP, findByTypeReq->startHandle, ATT_ECODE_ATTR_NOT_FOUND);
} else {
HCI.sendAclPkt(connectionHandle, ATT_CID, responseLength, response);
}
}
void ATTClass::readByGroupReq(uint16_t connectionHandle, uint16_t mtu, uint8_t dlen, uint8_t data[])
{
struct __attribute__ ((packed)) ReadByGroupReq {
uint16_t startHandle;
uint16_t endHandle;
uint16_t uuid;
} *readByGroupReq = (ReadByGroupReq*)data;
if (dlen != sizeof(ReadByGroupReq) || (readByGroupReq->uuid != BLETypeService && readByGroupReq->uuid != 0x2801)) {
sendError(connectionHandle, ATT_OP_READ_BY_GROUP_REQ, readByGroupReq->startHandle, ATT_ECODE_UNSUPP_GRP_TYPE);
return;
}
uint8_t response[mtu];
uint16_t responseLength;
response[0] = ATT_OP_READ_BY_GROUP_RESP;
response[1] = 0x00;
responseLength = 2;
for (uint16_t i = (readByGroupReq->startHandle - 1); i < GATT.attributeCount() && i <= (readByGroupReq->endHandle - 1); i++) {
BLELocalAttribute* attribute = GATT.attribute(i);
if (readByGroupReq->uuid != attribute->type()) {
// not the type
continue;
}
int uuidLen = attribute->uuidLength();
int infoSize = (uuidLen == 2) ? 6 : 20;
if (response[1] == 0) {
response[1] = infoSize;
}
if (response[1] != infoSize) {
// different size
break;
}
BLELocalService* service = (BLELocalService*)attribute;
// add the start handle
uint16_t startHandle = service->startHandle();
memcpy(&response[responseLength], &startHandle, sizeof(startHandle));
responseLength += sizeof(startHandle);
// add the end handle
uint16_t endHandle = service->endHandle();
memcpy(&response[responseLength], &endHandle, sizeof(endHandle));
responseLength += sizeof(endHandle);
// add the UUID
memcpy(&response[responseLength], service->uuidData(), uuidLen);
responseLength += uuidLen;
if ((responseLength + infoSize) > mtu) {
break;
}
}
if (responseLength == 2) {
sendError(connectionHandle, ATT_OP_READ_BY_GROUP_REQ, readByGroupReq->startHandle, ATT_ECODE_ATTR_NOT_FOUND);
} else {
HCI.sendAclPkt(connectionHandle, ATT_CID, responseLength, response);
}
}
int ATTClass::readByGroupReq(uint16_t connectionHandle, uint16_t startHandle, uint16_t endHandle, uint16_t uuid, uint8_t responseBuffer[])
{
struct __attribute__ ((packed)) {
uint8_t op;
uint16_t startHandle;
uint16_t endHandle;
uint16_t uuid;
} readByGroupReq = { ATT_OP_READ_BY_GROUP_REQ, startHandle, endHandle, uuid };
return sendReq(connectionHandle, &readByGroupReq, sizeof(readByGroupReq), responseBuffer);
}
void ATTClass::readByGroupResp(uint16_t connectionHandle, uint8_t dlen, uint8_t data[])
{
if (dlen < 2) {
return; // invalid, drop
}
if (connectionHandle == _pendingResp.connectionHandle && _pendingResp.op == ATT_OP_READ_BY_GROUP_RESP) {
_pendingResp.buffer[0] = ATT_OP_READ_BY_GROUP_RESP;
memcpy(&_pendingResp.buffer[1], data, dlen);
_pendingResp.length = dlen + 1;
}
}
void ATTClass::readOrReadBlobReq(uint16_t connectionHandle, uint16_t mtu, uint8_t opcode, uint8_t dlen, uint8_t data[])
{
if (opcode == ATT_OP_READ_REQ) {
if (dlen != sizeof(uint16_t)) {
sendError(connectionHandle, ATT_OP_READ_REQ, 0x0000, ATT_ECODE_INVALID_PDU);
return;
}
} else {
if (dlen != (sizeof(uint16_t) + sizeof(uint16_t))) {
sendError(connectionHandle, ATT_OP_READ_BLOB_REQ, 0x0000, ATT_ECODE_INVALID_PDU);
return;
}
}
uint16_t handle = *(uint16_t*)data;
uint16_t offset = (opcode == ATT_OP_READ_REQ) ? 0 : *(uint16_t*)&data[sizeof(handle)];
if ((uint16_t)(handle - 1) > GATT.attributeCount()) {
sendError(connectionHandle, opcode, handle, ATT_ECODE_ATTR_NOT_FOUND);
return;
}
uint8_t response[mtu];
uint16_t responseLength;
response[0] = (opcode == ATT_OP_READ_REQ) ? ATT_OP_READ_RESP : ATT_OP_READ_BLOB_RESP;
responseLength = 1;
BLELocalAttribute* attribute = GATT.attribute(handle - 1);
enum BLEAttributeType attributeType = attribute->type();
if (attributeType == BLETypeService) {
if (offset) {
sendError(connectionHandle, ATT_ECODE_ATTR_NOT_LONG, handle, ATT_ECODE_INVALID_PDU);
return;
}
BLELocalService* service = (BLELocalService*)attribute;
// add the UUID
uint8_t uuidLen = service->uuidLength();
memcpy(&response[responseLength], service->uuidData(), uuidLen);
responseLength += uuidLen;
} else if (attributeType == BLETypeCharacteristic) {
BLELocalCharacteristic* characteristic = (BLELocalCharacteristic*)attribute;
if (characteristic->handle() == handle) {
if (offset) {
sendError(connectionHandle, opcode, handle, ATT_ECODE_ATTR_NOT_LONG);
return;
}
// add the properties
response[responseLength++] = characteristic->properties();
// add the value handle
uint16_t valueHandle = characteristic->valueHandle();
memcpy(&response[responseLength], &valueHandle, sizeof(valueHandle));
responseLength += sizeof(valueHandle);
// add the UUID
uint8_t uuidLen = characteristic->uuidLength();
memcpy(&response[responseLength], characteristic->uuidData(), uuidLen);
responseLength += uuidLen;
} else {
if ((characteristic->properties() & BLERead) == 0) {
sendError(connectionHandle, opcode, handle, ATT_ECODE_READ_NOT_PERM);
return;
}
uint16_t valueLength = characteristic->valueLength();
if (offset >= valueLength) {
sendError(connectionHandle, opcode, handle, ATT_ECODE_INVALID_OFFSET);
return;
}
valueLength = min(mtu - responseLength, valueLength - offset);
for (int i = 0; i < ATT_MAX_PEERS; i++) {
if (_peers[i].connectionHandle == connectionHandle) {
characteristic->readValue(BLEDevice(_peers[i].addressType, _peers[i].address), offset, &response[responseLength], valueLength);
responseLength += valueLength;
}
}
}
} else if (attributeType == BLETypeDescriptor) {
BLELocalDescriptor* descriptor = (BLELocalDescriptor*)attribute;
uint16_t valueLength = descriptor->valueSize();
if (offset >= valueLength) {
sendError(connectionHandle, opcode, handle, ATT_ECODE_INVALID_OFFSET);
return;
}
valueLength = min(mtu - responseLength, valueLength - offset);
memcpy(&response[responseLength], descriptor->value() + offset, valueLength);
responseLength += valueLength;
}
HCI.sendAclPkt(connectionHandle, ATT_CID, responseLength, response);
}