Long range audio module HFP test report

Long range audio module Test Environment:

Sunny; No obstacles around; Straight road; Product is 1.5m above the ground.

Test preparation:909 Master +909 Slave

1. Prepare two BT909 modules, firmware version:  VER=FSC-BT909, V3.2.6, 20181105.
2. Solder the two BT909s to the daughter board and prepare two sets of FSC-TL001 development boards with Codec.
3. Install two BT909s on the FSC-TL001 development board and power them separately with two computers.
4. Send AT command to change the mode of two BT909 modules:

        Master mode command: AT+PROFILE=19

        Slave mode command: AT+PROFILE=1707

Connection steps: 

1. Use the serial port tool to query the MAC address code of the slave module.
     Command: AT+ADDR

2. Master module connect to the slave module via the serial port tool.  
    XXXXXXXXXXXX represents the twelve-bit slave MAC address.
    AT command of connecting to the slave module: AT+HFPCONN=XXXXXXXXXXXX

3. After successful connection, master module send audio command to slave module via serial port tool.
    Command: AT+HFPAUDIO=1

Test steps:

1. Plug the headphone or speaker into the SPK2 interface of the two development boards FSC-TL001.
2. Sound can be heard from headphone or speaker of the master  FSC-TL001 development board when speaking at MIC of  slave FSC-TL001 development board.
3. Sound can be heard from headphone or speaker of the slave  FSC-TL001 development board when speaking at MIC of  master FSC-TL001 development board.
4. Fix one of the two devices, move another, keep talking, ensure the sound quality is clear, no noise, the farthest distance without transposition

Test result:

The longest distance is 90m, if out of the range, the sound will be noise, trembling, intermittent and other issues.
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