add mic buf count and len settings

software/source/clients/esp32/src/client/client.ino

@@ -638,6 +638,8 @@ void InitI2SSpeakerOrMic(int mode)
         i2s_config.mode =
             (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_PDM);
         i2s_config.sample_rate = MIC_SAMPLE_RATE;
+        i2s_config.dma_buf_count = 8;
+        i2s_config.dma_buf_len = 240;
     }
     else
     {
@@ -876,4 +878,4 @@ void loop()
         M5.update();
         webSocket.loop();
     }
-}
+}