Sam Musso
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BLE_API
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Bluetooth Low Energy
Diff: services/URIBeacon2Service.h
- Revision:
- 169:e030a9308fcc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/services/URIBeacon2Service.h Fri Nov 28 14:11:22 2014 +0000
@@ -0,0 +1,248 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __BLE_URI_BEACON_2_SERVICE_H__
+#define __BLE_URI_BEACON_2_SERVICE_H__
+
+#include "BLEDevice.h"
+
+#define UUID_INITIALIZER_LIST(FIRST, SECOND) { \
+ 0xee, 0x0c, FIRST, SECOND, 0x87, 0x86, 0x40, 0xba, \
+ 0xab, 0x96, 0x99, 0xb9, 0x1a, 0xc9, 0x81, 0xd8, \
+}
+const uint8_t URIBeacon2ControlServiceUUID[] = UUID_INITIALIZER_LIST(0x20, 0x80);
+const uint8_t lockedStateCharUUID[] = UUID_INITIALIZER_LIST(0x20, 0x81);
+const uint8_t uriDataCharUUID[] = UUID_INITIALIZER_LIST(0x20, 0x84);
+const uint8_t flagsCharUUID[] = UUID_INITIALIZER_LIST(0x20, 0x85);
+const uint8_t txPowerCharUUID[] = UUID_INITIALIZER_LIST(0x20, 0x86);
+const uint8_t beaconPeriodCharUUID[] = UUID_INITIALIZER_LIST(0x20, 0x88);
+
+class URIBeacon2Service {
+public:
+ URIBeacon2Service(BLEDevice &ble_, const char *urldata, uint8_t flags_ = 0, uint8_t power_ = 0) :
+ ble(ble_), payloadIndex(0), serviceDataPayload(),
+ lockedState(false),
+ uriDataLength(0),
+ uriDataValue(),
+ flags(flags_),
+ power(power_),
+ beaconPeriod(Gap::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(1000)), /* 1hz */
+ lockedStateChar(lockedStateCharUUID, (uint8_t *)&lockedState, 1, 1, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ),
+ uriDataChar(uriDataCharUUID,
+ uriDataValue,
+ MAX_SIZE_URI_DATA_CHAR_VALUE,
+ MAX_SIZE_URI_DATA_CHAR_VALUE,
+ GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE),
+ flagsChar(flagsCharUUID, &flags, 1, 1, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE),
+ // txPowerChar(txPowerCharUUID, &power, 1, 1, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE)
+ beaconPeriodChar(beaconPeriodCharUUID, (uint8_t *)&beaconPeriod, 2, 2,
+ GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE)
+ {
+ if ((urldata == NULL) || ((uriDataLength = strlen(urldata)) == 0)) {
+ return;
+ }
+ strncpy(reinterpret_cast<char *>(uriDataValue), urldata, MAX_SIZE_URI_DATA_CHAR_VALUE);
+
+ setup();
+
+ static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
+ if (serviceAdded) {
+ return;
+ }
+
+ GattCharacteristic *charTable[] = {&lockedStateChar, &uriDataChar, &flagsChar, &beaconPeriodChar};
+ GattService beaconControlService(URIBeacon2ControlServiceUUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+
+ ble.addService(beaconControlService);
+ serviceAdded = true;
+
+ ble.onDataWritten(this, &URIBeacon2Service::onDataWritten);
+ }
+
+protected:
+ /**
+ * This callback allows the DFU service to receive the initial trigger to
+ * handover control to the bootloader; but first the application is given a
+ * chance to clean up.
+ */
+ virtual void onDataWritten(const GattCharacteristicWriteCBParams *params) {
+ if (params->charHandle == uriDataChar.getValueAttribute().getHandle()) {
+ if (lockedState) { /* When locked, the device isn't allowed to update the uriData characteristic. */
+ /* Restore GATT database with previous value. */
+ ble.updateCharacteristicValue(uriDataChar.getValueAttribute().getHandle(), uriDataValue, uriDataLength);
+ return;
+ }
+
+ /* We don't handle very large writes at the moment. */
+ if ((params->offset != 0) || (params->len > MAX_SIZE_URI_DATA_CHAR_VALUE)) {
+ return;
+ }
+
+ uriDataLength = params->len;
+ memcpy(uriDataValue, params->data, uriDataLength);
+ } else if (params->charHandle == flagsChar.getValueAttribute().getHandle()) {
+ if (lockedState) { /* When locked, the device isn't allowed to update the flags characteristic. */
+ /* Restore GATT database with previous value. */
+ ble.updateCharacteristicValue(flagsChar.getValueAttribute().getHandle(), &flags, 1 /* size */);
+ return;
+ } else {
+ flags = *(params->data);
+ }
+ } else if (params->charHandle == beaconPeriodChar.getValueAttribute().getHandle()) {
+ if (lockedState) { /* When locked, the device isn't allowed to update the flags characteristic. */
+ /* Restore GATT database with previous value. */
+ ble.updateCharacteristicValue(beaconPeriodChar.getValueAttribute().getHandle(), (uint8_t *)&beaconPeriod, 2 /* size */);
+ return;
+ } else {
+ beaconPeriod = *((uint16_t *)(params->data));
+ }
+ }
+ setup();
+ ble.setAdvertisingPayload();
+ }
+
+ /**
+ * For debugging only.
+ */
+ void dumpEncodedSeviceData() const {
+ printf("encoded: '");
+ for (unsigned i = 0; i < payloadIndex; i++) {
+ printf(" %02x", serviceDataPayload[i]);
+ }
+ printf("'\r\n");
+ }
+
+private:
+ void setup(void) {
+ const uint8_t BEACON_UUID[] = {0xD8, 0xFE};
+
+ payloadIndex = 0;
+ serviceDataPayload[payloadIndex++] = BEACON_UUID[0];
+ serviceDataPayload[payloadIndex++] = BEACON_UUID[1];
+ serviceDataPayload[payloadIndex++] = flags;
+ serviceDataPayload[payloadIndex++] = power;
+
+ const char *urlData = reinterpret_cast<char *>(uriDataValue);
+ size_t sizeofURLData = uriDataLength;
+ size_t encodedBytes = encodeURISchemePrefix(urlData, sizeofURLData) + encodeURI(urlData, sizeofURLData);
+
+ ble.clearAdvertisingPayload();
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, BEACON_UUID, sizeof(BEACON_UUID));
+ ble.accumulateAdvertisingPayload(GapAdvertisingData::SERVICE_DATA, serviceDataPayload, encodedBytes + 4);
+
+ ble.setAdvertisingInterval(beaconPeriod);
+ ble.setTxPower(power);
+ }
+
+ size_t encodeURISchemePrefix(const char *&urldata, size_t &sizeofURLData) {
+ const char *prefixes[] = {
+ "http://www.",
+ "https://www.",
+ "http://",
+ "https://",
+ "urn:uuid:"
+ };
+
+ size_t encodedBytes = 0;
+ const size_t NUM_PREFIXES = sizeof(prefixes) / sizeof(char *);
+ for (unsigned i = 0; i < NUM_PREFIXES; i++) {
+ size_t prefixLen = strlen(prefixes[i]);
+ if (strncmp(urldata, prefixes[i], prefixLen) == 0) {
+ serviceDataPayload[payloadIndex++] = i;
+ encodedBytes = 1;
+
+ urldata += prefixLen;
+ sizeofURLData -= prefixLen;
+ break;
+ }
+ }
+
+ return encodedBytes;
+ }
+
+ size_t encodeURI(const char *urldata, size_t sizeofURLData) {
+ const char *suffixes[] = {
+ ".com/",
+ ".org/",
+ ".edu/",
+ ".net/",
+ ".info/",
+ ".biz/",
+ ".gov/",
+ ".com",
+ ".org",
+ ".edu",
+ ".net",
+ ".info",
+ ".biz",
+ ".gov"
+ };
+ const size_t NUM_SUFFIXES = sizeof(suffixes) / sizeof(char *);
+
+ size_t encodedBytes = 0;
+ while (sizeofURLData && (payloadIndex < MAX_SIZEOF_SERVICE_DATA_PAYLOAD)) {
+ /* check for suffix match */
+ unsigned i;
+ for (i = 0; i < NUM_SUFFIXES; i++) {
+ size_t suffixLen = strlen(suffixes[i]);
+ if ((suffixLen == 0) || (sizeofURLData < suffixLen)) {
+ continue;
+ }
+
+ if (strncmp(urldata, suffixes[i], suffixLen) == 0) {
+ serviceDataPayload[payloadIndex++] = i;
+ ++encodedBytes;
+ urldata += suffixLen;
+ sizeofURLData -= suffixLen;
+ break; /* from the for loop for checking against suffixes */
+ }
+ }
+ /* This is the default case where we've got an ordinary character which doesn't match a suffix. */
+ if (i == NUM_SUFFIXES) {
+ serviceDataPayload[payloadIndex++] = *urldata;
+ ++encodedBytes;
+ ++urldata;
+ --sizeofURLData;
+ }
+ }
+
+ return encodedBytes;
+ }
+
+private:
+ static const size_t MAX_SIZEOF_SERVICE_DATA_PAYLOAD = 27;
+ static const size_t MAX_SIZE_URI_DATA_CHAR_VALUE = 48;
+
+private:
+ BLEDevice &ble;
+
+ size_t payloadIndex;
+ uint8_t serviceDataPayload[MAX_SIZEOF_SERVICE_DATA_PAYLOAD];
+ bool lockedState;
+ uint16_t uriDataLength;
+ uint8_t uriDataValue[MAX_SIZE_URI_DATA_CHAR_VALUE];
+ uint8_t flags;
+ uint8_t power;
+ uint16_t beaconPeriod;
+
+ GattCharacteristic lockedStateChar;
+ GattCharacteristic uriDataChar;
+ GattCharacteristic flagsChar;
+ // GattCharacteristic txPowerChar;
+ GattCharacteristic beaconPeriodChar;
+};
+
+#endif /* #ifndef __BLE_URI_BEACON_2_SERVICE_H__*/
\ No newline at end of file
