1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
|
/**
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.direct_bt;
import java.util.List;
/**
* Representing a Gatt Characteristic object from the GATT client perspective.
*
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3 Characteristic Definition
*
* handle -> CDAV value
*
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.6.1 Discover All Characteristics of a Service
*
* The handle represents a service's characteristics-declaration
* and the value the Characteristics Property, Characteristics Value Handle _and_ Characteristics UUID.
*
* See {@link DBGattChar.UUID16} for selected standard GATT characteristic numbers in UUID16 format
* and {@link BTUtils#toUUID128(String)} for their conversion to UUID128.
*/
public interface BTGattChar extends BTObject
{
/**
* Find a {@link BTGattDesc} by its desc_uuid.
*
* @parameter desc_uuid the UUID of the desired {@link BTGattDesc}
* @return The matching descriptor or null if not found
*/
BTGattDesc findGattDesc(final String desc_uuid);
/**
* Return the Client Characteristic Configuration BTGattDesc if available or null.
*
* The {@link BTGattDesc#UUID128#CCC_DESC} has been indexed while
* retrieving the GATT database from the server.
*/
BTGattDesc getClientCharConfig();
/**
* Return the User Description BTGattDesc if available or null.
*
* The {@link BTGattDesc#UUID128#USER_DESC} has been indexed while
* retrieving the GATT database from the server.
*/
BTGattDesc getUserDescription();
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration
*
* Method enables notification and/or indication for this characteristic at BLE level.
*
* Implementation masks this Characteristic properties PropertyBitVal::Notify and PropertyBitVal::Indicate
* with the respective user request parameters, hence removes unsupported requests.
*
* Notification and/or indication configuration is only performed per characteristic if changed.
*
* It is recommended to utilize notification over indication, as its link-layer handshake
* and higher potential bandwidth may deliver material higher performance.
*
* @param enableNotification
* @param enableIndication
* @param enabledState array of size 2, holding the resulting enabled state for notification and indication.
* @return false if this characteristic has no PropertyBitVal::Notify or PropertyBitVal::Indication present,
* or there is no GATTDescriptor of type ClientCharacteristicConfiguration, or if the operation has failed.
* Otherwise returns true.
*
* @throws IllegalStateException if notification or indication is set to be enabled
* and the {@link BTDevice}'s GATTHandler is null, i.e. not connected
*
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.0.0
*/
boolean configNotificationIndication(final boolean enableNotification, final boolean enableIndication, final boolean enabledState[/*2*/])
throws IllegalStateException;
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration
*
* Method will attempt to enable notification on the BLE level, if available,
* otherwise indication if available.
*
* Notification and/or indication configuration is only performed per characteristic if changed.
*
* It is recommended to utilize notification over indication, as its link-layer handshake
* and higher potential bandwidth may deliver material higher performance.
*
* @param enabledState array of size 2, holding the resulting enabled state for notification and indication.
* @return false if this characteristic has no PropertyBitVal::Notify or PropertyBitVal::Indication present,
* or there is no GATTDescriptor of type ClientCharacteristicConfiguration, or if the operation has failed.
* Otherwise returns true.
*
* @throws IllegalStateException if notification or indication is set to be enabled
* and the {@link BTDevice}'s GATTHandler is null, i.e. not connected
*
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.0.0
*/
boolean enableNotificationOrIndication(final boolean enabledState[/*2*/])
throws IllegalStateException;
/**
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.3.3 Client Characteristic Configuration
*
* Method will attempt to disable notification and indication on the BLE level.
*
* Notification and/or indication configuration is only performed per characteristic if changed.
*
* @return false if this characteristic has no PropertyBitVal::Notify or PropertyBitVal::Indication present,
* or there is no BTGattDesc of type ClientCharacteristicConfiguration, or if the operation has failed.
* Otherwise returns true.
*
* @throws IllegalStateException if notification or indication is set to be enabled
* and the {@link BTDevice}'s GATTHandler is null, i.e. not connected
*
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.4.0
*/
boolean disableIndicationNotification() throws IllegalStateException;
/**
* Add the given BTGattCharListener to the listener list if not already present.
*
* Occurring notifications and indications for this characteristic,
* if enabled via {@link #configNotificationIndication(boolean, boolean, boolean[])}
* or {@link #enableNotificationOrIndication(boolean[])},
* will call the respective BTGattCharListener callback method.
*
* Returns true if the given listener is not element of the list and has been newly added,
* otherwise false.
*
* @param listener A {@link {@link BTGattCharListener}} instance, listening to this {@link BTGattChar}'s events
* @return if successful, true is being returned, otherwise false.
* @throws IllegalStateException if the DBTDevice's GATTHandler is null, i.e. not connected
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.4.0
*/
boolean addCharListener(final BTGattCharListener listener) throws IllegalStateException;
/**
* Add the given BTGattCharListener to the listener list if not already present
* and if enabling the notification <i>or</i> indication for this characteristic at BLE level was successful.<br>
* Notification and/or indication configuration is only performed per characteristic if changed.
*
* Implementation will enable notification if available,
* otherwise indication will be enabled if available. <br>
* Implementation uses {@link #enableNotificationOrIndication(boolean[])} to enable either.
*
* Occurring notifications and indications for this characteristic
* will call the respective BTGattCharListener callback method.
*
* Returns true if enabling the notification and/or indication was successful
* and if the given listener is not element of the list and has been newly added,
* otherwise false.
*
* @param listener A {@link BTGattChar.Listener} instance, listening to this {@link BTGattChar}'s events
* @param enabledState array of size 2, holding the resulting enabled state for notification and indication
* using {@link #enableNotificationOrIndication(boolean[])}
* @return if successful, true is being returned, otherwise false.
* @throws IllegalStateException if the {@link BTDevice}'s GATTHandler is null, i.e. not connected
* @throws IllegalStateException if the given {@link BTGattChar.Listener} is already in use, i.e. added.
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.4.0
*/
boolean addCharListener(final BTGattCharListener listener, final boolean enabledState[/*2*/])
throws IllegalStateException;
/**
* Remove the given associated {@link BTGattCharListener} from the listener list if present.
*
* To disables the notification and/or indication for this characteristic at BLE level
* use {@link #disableIndicationNotification()} when desired.
*
* @param listener returned {@link BTGattCharListener} from {@link #addCharListener(Listener)} ...
* @return true if successful, otherwise false.
*
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.4.0
*/
boolean removeCharListener(final BTGattCharListener listener);
/**
* Disables the notification and/or indication for this characteristic BLE level
* if {@code disableIndicationNotification == true}
* and removes all associated {@link BTGattChar.Listener} or {@link BTGattCharListener} from the listener list,
* which are associated with this characteristic instance.
* <p>
* If the DBTDevice's GATTHandler is null, i.e. not connected, {@code false} is being returned.
* </p>
*
* @param shallDisableIndicationNotification if true, disables the notification and/or indication for this characteristic
* using {@link #disableIndicationNotification()}
* @return number of removed listener.
*
* @see #disableIndicationNotification()
* @see #enableNotificationOrIndication(boolean[])
* @see #configNotificationIndication(boolean, boolean, boolean[])
* @see #addCharListener(BTGattCharListener)
* #see #addCharListener(BTGattCharListener, boolean[])
* @see #removeCharListener(BTGattCharListener)
* @see #removeAllAssociatedCharListener(boolean)
* @since 2.0.0
*/
int removeAllAssociatedCharListener(final boolean shallDisableIndicationNotification);
/** Get the UUID of this characteristic.
* @return The 128 byte UUID of this characteristic, NULL if an error occurred
*/
String getUUID();
/** Returns the service to which this characteristic belongs to.
* @return The service.
*/
BTGattService getService();
/** Returns true if notification for changes of this characteristic are activated.
* @param enabledState array of size 2, storage for the current enabled state for notification and indication.
* @return True if either notification or indication is enabled
*/
boolean getNotifying(final boolean enabledState[/*2*/]);
/**
* Returns the properties of this characteristic.
* <p>
* BT Core Spec v5.2: Vol 3, Part G GATT: 3.3.1.1 Characteristic Properties
* </p>
*/
GattCharPropertySet getProperties();
/** Returns a list of BluetoothGattDescriptors this characteristic exposes.
* @return A list of BluetoothGattDescriptors exposed by this characteristic
* NULL if an error occurred
*/
List<BTGattDesc> getDescriptors();
/** Reads the value of this characteristic.
* @return A std::vector<unsgined char> containing the value of this characteristic.
*/
byte[] readValue() throws BTException;
/**
* Writes the value of this characteristic,
* using one of the following methods depending on {@code withResponse}
* <pre>
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.3 Write Characteristic Value
* BT Core Spec v5.2: Vol 3, Part G GATT: 4.9.1 Write Characteristic Value Without Response
* </pre>
* @param[in] arg_value The data as vector<uchar>
* to be written packed in a GBytes struct
* @param withResponse if {@code true} a subsequent ATT_WRITE_RSP is expected, otherwise not.
* @return TRUE if value was written successfully
* @since 2.0.0
* @implNote {@code withResponse} parameter has been added since 2.0.0
*/
boolean writeValue(byte[] argValue, boolean withResponse) throws BTException;
@Override
String toString();
}
|