gfps: 添加认证测试和FAQ 20260505

Change-Id: I71e676b997159a141ca07d16f82a73b45f4b2410

initial+pair，手机不来连bredr.md

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+# initial pair，手机不来连bredr
+
+手机log显示 Secret handshake failed
+
+<table class="confluenceTable">
+<tbody>
+<tr>
+<th class="confluenceTh" scope="col">   Line 155121: 11-13 18:53:14.873 10160 23283 24046 I FastPair: Send Progress to validator, step=Handshake<br />
+    Line 155130: 11-13 18:53:14.993 10160 23283 24046 I FastPair: [trigger-id=Scan2745BCA1, feature-id=Inpa]: FPDC: handshakeForKeyBasedPairing: device=XX:XX:XX:XX:82:D6, type=0x00, flag=0x2C<br />
+    Line 155131: 11-13 18:53:14.994 10160 23283 24046 I FastPair: Handshake XX:XX:XX:XX:82:D6, generates key by ECDH.<br />
+    Line 155132: 11-13 18:53:15.001 10160 23283 24046 I FastPair: Handshake XX:XX:XX:XX:82:D6, flags 44.<br />
+    Line 155133: 11-13 18:53:15.001 10160 23283 24046 I FastPair: [trigger-id=Scan2745BCA1, feature-id=Inpa]: EventLoggerWrapper: cuj-state=UPDATE: SECRET_HANDSHAKE_GATT_COMMUNICATION START<br />
+    Line 155134: 11-13 18:53:15.003 10160 23283 24046 I FastPair: Handshake Message: type (00), flag (2C).<br />
+    Line 155136: 11-13 18:53:15.083 10160 23283 24046 I FastPair: Writing handshake packet to address=XX:XX:XX:XX:82:D6<br />
+    Line 155137: 11-13 18:53:15.218 10160 23283 24046 I FastPair: Waiting handshake packet from address=XX:XX:XX:XX:82:D6<br />
+    Line 155356: 11-13 18:53:25.222 10160 23283 24046 W FastPair: Secret handshake failed, address=XX:XX:XX:XX:82:D6, spent time=10219ms, retryCount=0</th>
+</tr>
+&#10;</tbody>
+</table>
+
+耳机log对应的现象就是
+
+正常log：
+
+我们有回kbp response的
+
+![](images/initial+pair，手机不来连bredr_06371dd8.jpg)
+
+不正常的log
+
+我们没有回kbp response
+
+![](images/initial+pair，手机不来连bredr_c65bc64f.jpg)