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25.7 AT+EHFVTS ..................................................................................................................... 271
25.8 AT+EHFRVC .................................................................................................................... 272
25.9 Unsolicited result code: Notify when call state changed finish +EHFVGS ....................... 272
25.10 Unsolicited result code: Notify when call state changed finish +EHFCME ...................... 273
26 GATT AT Command ................................................................................................................. 274
26.1 AT+GATSREG – (De)Register GATT Server .................................................................. 274
26.2 AT+GATSCON: (Dis)Connect GATT Server to another device ....................................... 275
26.3 URC +GATSCON: indicate server a connection‘s status ................................................. 276
26.4 AT+GATSS: add/remove a service .................................................................................. 277
26.5 AT+GATSI: add/remove a include service ....................................................................... 278
26.6 AT+GATSC: add/remove a characteristic to/from an existed service .............................. 279
26.7 AT+GATSD: add/remove a descriptor to/from an existed service ................................... 280
26.8 AT+GATSST: start/stop a service .................................................................................... 281
26.9 AT+GATSIND: send an indication to a client ................................................................... 282
26.10 AT+GATSRSP: send response to a client........................................................................ 284
26.11 URC +GATRREQ: indicate server that a client has a read request ................................. 285
26.12 URC +GATWREQ: indicate server that a client has a write request ............................... 286
26.13 URC +GATEWREQ: indicate server that a client ask server to exec or cancel the write
request indicated (trans_id) before ................................................................................... 287
27 GATT Client AT Command ...................................................................................................... 289
27.1 AT+GATCREG: (De)Register GATT Client ...................................................................... 289
27.2 AT+GATCSCAN: Start or Stop Scan ............................................................................... 290
27.3 URC +GATCSCANRESULT: report scan result .............................................................. 290
27.4 AT+GATCCON: (Dis)Connect GATT Client to another device ........................................ 291
27.5 URC +GATCCON: indicate client a connection‘s status .................................................. 292
27.6 AT+GATCRSH: Refresh peer‘s service ........................................................................... 293
28 Audio AT Command ................................................................................................................. 297
28.1 AT+EECHO – Echo Cancellation ..................................................................................... 297
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