The system can be flashed with a special MTE image that allows for connecting to the device over WiFi and running commands for testing and provisioning it via a python based command shell.

Note: The EPS32 does not have enough code storage space to included both the Bluetooth Audio and WiFi libraries, as such the MTE functionality was split out into a separate build

MTE mode can be enabled via menuconfig with the following sequence:

1. Open menuconfig: idf.py menuconfig
2. Navigate to MTE Config -> Operation Mode -> Include WIFI in build
3. Make sure Include WIFI in build is selected and press S to save and then exit

1. Open menuconfig: idf.py menuconfig
2. Navigate to WiFi SSID and replace myssid with your networks SSID info
3. Navigate to WiFi Password and replace mypassword with your networks SSID info
4. Press S to save and then exit

While the system is flashed with the MTE image, the system can be connected to via WiFi and execute test/provisioning commands it receives. The command shell can be used as an interface to send these commands. Note: The IP address of the unit will be displayed on the display as it boots.

• Navigate to Scripts directory inside Daftpunk_Speaker_IDF
• Run cmd_test.py --ip <IP address of unit> to open command shell
• Run the help command to see what commands are available. Note: Commands are documented below

• Description: Sends string to device and echoes the response back
• Command Format: echo <echo_string>
• Arguments:
  • echo_string: String to be echoed back
• Usage:

• Description: Calculates CRC-16 for a given input buffer
• Command Format: crc
• Arguments:
  • input: Input string to be converted to bytearray and used to perform CRC
• Usage:

• Description: Writes specified file into fixed NVM location on device
• Command Format: nvm_write <file_path>
• Arguments:
  • file_path: Path of file to be written to NVM
• Usage:

• Description: Writes specified audio file to NVM on device.

Note: Audio file must be in raw format (Signed 16-bit PCM, Little Endian, Stereo, 44.1KHz Sample Rate). See below for instructions on converting files with Audacity

• Command Format: write_audio_asset <Audio ID (0 - 7)> <file_path> <filename_dev>
• Arguments:
  • Audio ID: Audio reference ID for the audio file.
  • File Path: Path of the audio file to be written to NVM
  • File Name Device: Name of the file saved into NVM's filesystem
• Usage:

• Description: Prints audio metadata for each audio slot
• Command Format: get_audio_metadata
• Arguments: None
• Usage:

• Description: Plays specificed audio file based on Audio ID
• Command Format: play_audio_asset <Audio ID (0 - 7)>
• Arguments:
  • Audio ID: Audio reference ID for the audio file
• Usage:

• Description: Formats flash storage and erases all NVM data
• Command Format: nvm_erase_chip
• Arguments: None
• Usage:

• Open audio file with Audacity

• In lower-left corner, set Project Rate (Hz) to 44100

  

• Navigate to File -> Export -> Export Audio

  • In the Save as type: dropdown, select Other uncompressed files
  • In the Header: dropdown, select RAW (header-less)
  • In the Encoding: dropdown, select Signed 16-bit PCM
  • Give the file a name and save