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Modify functions that manipulate adv payload

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Modify the functions addData() and updateData() to correctly update the payload
information for a specified AD type if that type was already present in the
payload. For addData() if the AD type is not found, it is added to the payload.
In contrast, in updateData() if the AD type is not found an error is returned.

Documentation was updated accordingly.
master
Andres Amaya Garcia 7 years ago
parent 1381ba46e7
commit 39e3e8d151
2 changed files with 113 additions and 121 deletions
Show Stats Download Patch File Download Diff File

5
ble/Gap.h
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@ -620,8 +620,7 @@ public:
/**
* Update a particular ADV field in the advertising payload (based on
* matching type and length). Note: the length of the new data must be the
* same as the old one.
* matching type).
*
* @param[in] type The ADV type field describing the variable length data.
* @param[in] data Data bytes.
@ -630,7 +629,7 @@ public:
* @note: If advertisements are enabled, then the update will take effect immediately.
*
* @return BLE_ERROR_NONE if the advertisement payload was updated based on
* a <type, len> match; otherwise, an appropriate error.
* matching AD type; otherwise, an appropriate error.
*/
ble_error_t updateAdvertisingPayload(GapAdvertisingData::DataType type, const uint8_t *data, uint8_t len) {
if (type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {

229
ble/GapAdvertisingData.h
Unescape View File

@ -202,149 +202,63 @@ public:
/**
* Adds advertising data based on the specified AD type (see DataType).
* If the supplied AD type is already present in the advertising
* payload, then the value is updated.
*
* @param advDataType The Advertising 'DataType' to add.
* @param payload Pointer to the payload contents.
* @param len Size of the payload in bytes.
* @param[in] advDataType The Advertising 'DataType' to add.
* @param[in] payload Pointer to the payload contents.
* @param[in] len Size of the payload in bytes.
*
* @return BLE_ERROR_BUFFER_OVERFLOW if the specified data would cause the
* advertising buffer to overflow, else BLE_ERROR_NONE.
* @return BLE_ERROR_BUFFER_OVERFLOW if the new value causes the
* advertising buffer to overflow. BLE_ERROR_NONE is returned
* on success.
*
* @note When the specified AD type is INCOMPLETE_LIST_16BIT_SERVICE_IDS,
* COMPLETE_LIST_16BIT_SERVICE_IDS, INCOMPLETE_LIST_32BIT_SERVICE_IDS,
* COMPLETE_LIST_32BIT_SERVICE_IDS, INCOMPLETE_LIST_128BIT_SERVICE_IDS,
* COMPLETE_LIST_128BIT_SERVICE_IDS or LIST_128BIT_SOLICITATION_IDS the
* supplied value is appended to the values previously added to the
* payload.
*/
ble_error_t addData(DataType advDataType, const uint8_t *payload, uint8_t len)
ble_error_t addData(DataType_t advDataType, const uint8_t *payload, uint8_t len)
{
ble_error_t result = BLE_ERROR_BUFFER_OVERFLOW;
// find field
uint8_t* field = findField(advDataType);
// Field type already exist, either add to field or replace
if (field) {
switch(advDataType) {
// These fields will be overwritten with the new value
case FLAGS:
case SHORTENED_LOCAL_NAME:
case COMPLETE_LOCAL_NAME:
case TX_POWER_LEVEL:
case DEVICE_ID:
case SLAVE_CONNECTION_INTERVAL_RANGE:
case SERVICE_DATA:
case APPEARANCE:
case ADVERTISING_INTERVAL:
case MANUFACTURER_SPECIFIC_DATA: {
// current field length, with the type subtracted
uint8_t dataLength = field[0] - 1;
// new data has same length, do in-order replacement
if (len == dataLength) {
for (uint8_t idx = 0; idx < dataLength; idx++) {
field[2 + idx] = payload[idx];
}
} else {
// check if data fits
if ((_payloadLen - dataLength + len) <= GAP_ADVERTISING_DATA_MAX_PAYLOAD) {
// remove old field
while ((field + dataLength + 2) < &_payload[_payloadLen]) {
*field = field[dataLength + 2];
field++;
}
// reduce length
_payloadLen -= dataLength + 2;
// add new field
result = appendField(advDataType, payload, len);
}
}
break;
}
// These fields will have the new data appended if there is sufficient space
case INCOMPLETE_LIST_16BIT_SERVICE_IDS:
case COMPLETE_LIST_16BIT_SERVICE_IDS:
case INCOMPLETE_LIST_32BIT_SERVICE_IDS:
case COMPLETE_LIST_32BIT_SERVICE_IDS:
case INCOMPLETE_LIST_128BIT_SERVICE_IDS:
case COMPLETE_LIST_128BIT_SERVICE_IDS:
case LIST_128BIT_SOLICITATION_IDS: {
// check if data fits
if ((_payloadLen + len) <= GAP_ADVERTISING_DATA_MAX_PAYLOAD) {
// make room for new field by moving the remainder of the
// advertisement payload "to the right" starting after the
// TYPE field.
uint8_t* end = &_payload[_payloadLen];
while (&field[1] < end) {
end[len] = *end;
end--;
}
// insert new data
for (uint8_t idx = 0; idx < len; idx++) {
field[2 + idx] = payload[idx];
}
// increment lengths
field[0] += len;
_payloadLen += len;
result = BLE_ERROR_NONE;
}
break;
}
// Field exists but updating it is not supported. Abort operation.
default:
result = BLE_ERROR_NOT_IMPLEMENTED;
break;
}
// Field type already exist, either add to field or replace
return updateFieldPayload(advDataType, payload, len, field);
} else {
// field doesn't exists, insert new
result = appendField(advDataType, payload, len);
return appendField(advDataType, payload, len);
}
return result;
}
/**
* Update a particular ADV field in the advertising payload (based on
* matching type and length). Note: the length of the new data must be the
* same as the old one.
* matching type).
*
* @param[in] advDataType The Advertising 'DataType' to add.
* @param[in] payload Pointer to the payload contents.
* @param[in] len Size of the payload in bytes.
*
* @return BLE_ERROR_UNSPECIFIED if the specified field is not found, else
* BLE_ERROR_NONE.
* @return BLE_ERROR_UNSPECIFIED if the specified field is not found,
* BLE_ERROR_BUFFER_OVERFLOW if the new value causes the
* advertising buffer to overflow. BLE_ERROR_NONE is returned
* on success.
*/
ble_error_t updateData(DataType_t advDataType, const uint8_t *payload, uint8_t len)
{
if ((payload == NULL) || (len == 0)) {
return BLE_ERROR_INVALID_PARAM;
}
/* A local struct to describe an ADV field. This definition comes from the Bluetooth Core Spec. (v4.2) Part C, Section 11. */
struct ADVField_t {
uint8_t len; /* Describes the length (in bytes) of the following type and bytes. */
uint8_t type; /* Should have the same representation of DataType_t (above). */
uint8_t bytes[0]; /* A placeholder for variable length data. */
};
/* Iterate over the adv fields looking for the first match. */
uint8_t byteIndex = 0;
while (byteIndex < _payloadLen) {
ADVField_t *currentADV = (ADVField_t *)&_payload[byteIndex];
if ((currentADV->len == (len + 1)) && /* Incoming len only describes the payload, whereas ADV->len describes [type + payload]. */
(currentADV->type == advDataType)) {
memcpy(currentADV->bytes, payload, len);
return BLE_ERROR_NONE;
}
// find field
uint8_t* field = findField(advDataType);
byteIndex += (currentADV->len + 1); /* Advance by len+1; '+1' is needed to span the len field itself. */
if (field) {
// Field type already exist, either add to field or replace
return updateFieldPayload(advDataType, payload, len, field);
} else {
// field doesn't exists, return an error
return BLE_ERROR_UNSPECIFIED;
}
return BLE_ERROR_UNSPECIFIED;
}
/**
@ -475,6 +389,85 @@ private:
return NULL;
}
/**
* Given the a pointer to a field in the advertising payload it replaces
* the existing data in the field with the supplied data.
* Returns BLE_ERROR_NONE on success.
*/
ble_error_t updateFieldPayload(DataType_t advDataType, const uint8_t *payload, uint8_t len, uint8_t* field)
{
ble_error_t result = BLE_ERROR_BUFFER_OVERFLOW;
switch(advDataType) {
// These fields will have the new data appended if there is sufficient space
case INCOMPLETE_LIST_16BIT_SERVICE_IDS:
case COMPLETE_LIST_16BIT_SERVICE_IDS:
case INCOMPLETE_LIST_32BIT_SERVICE_IDS:
case COMPLETE_LIST_32BIT_SERVICE_IDS:
case INCOMPLETE_LIST_128BIT_SERVICE_IDS:
case COMPLETE_LIST_128BIT_SERVICE_IDS:
case LIST_128BIT_SOLICITATION_IDS: {
// check if data fits
if ((_payloadLen + len) <= GAP_ADVERTISING_DATA_MAX_PAYLOAD) {
// make room for new field by moving the remainder of the
// advertisement payload "to the right" starting after the
// TYPE field.
uint8_t* end = &_payload[_payloadLen];
while (&field[1] < end) {
end[len] = *end;
end--;
}
// insert new data
for (uint8_t idx = 0; idx < len; idx++) {
field[2 + idx] = payload[idx];
}
// increment lengths
field[0] += len;
_payloadLen += len;
result = BLE_ERROR_NONE;
}
break;
}
// These fields will be overwritten with the new value
default: {
// current field length, with the type subtracted
uint8_t dataLength = field[0] - 1;
// new data has same length, do in-order replacement
if (len == dataLength) {
for (uint8_t idx = 0; idx < dataLength; idx++) {
field[2 + idx] = payload[idx];
}
} else {
// check if data fits
if ((_payloadLen - dataLength + len) <= GAP_ADVERTISING_DATA_MAX_PAYLOAD) {
// remove old field
while ((field + dataLength + 2) < &_payload[_payloadLen]) {
*field = field[dataLength + 2];
field++;
}
// reduce length
_payloadLen -= dataLength + 2;
// add new field
result = appendField(advDataType, payload, len);
}
}
break;
}
}
return result;
}
uint8_t _payload[GAP_ADVERTISING_DATA_MAX_PAYLOAD];
uint8_t _payloadLen;
uint16_t _appearance;

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