Introduction: DWMM0 Mobile Connectivity Mezzanine

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This is a simple demonstration of use of the DWMM0 mezzanine for remote data logging.
The client side of this application runs a python script (client.py) responsible for reading GNSS/GPS data and transmitting it to the server side (through TCP/IP protocol), which runs a different script (server.py) in charge of collecting and storing incoming data.

Reference : project website

Step 1: DWMM0 - HARDWARE DESCRIPTION

The DWMM0 Mezzanine is an add-on accessory board for the DragonBoard 410c single board computer (or any other 96Boards standard SBC). This mezzanine is composed of 5 main subsystems :

  • Li-Ion Battery Charge Controller
  • USB 2.0 Hub Controller
  • DC/DC Boost Converter (from 3.0V to 9.0V)
  • LPWA/GNSS Module (with a Quectel BG96 device)
  • DC/DC Converters (from 5V to 3.3V and 4.1V)

Step 2: DWMMO - GNSS/GPS LOGGER APPLICATION

The original python scripts for this application can be download from here : download scripts

The server.py script must run on any computer with internet connection (SERVER side).
The client.py script mist run on a DragonBoard 410c with the DWMM0 Mezzanine (CLIENT side).

Each script has its own "Configurable Parameters" session, that must be adjusted by the user (such as TCP/IP address, ports, network APN, username and password).

Step 3: DWMM0 - GENERATING KML FILE

The updated_python_scripts.zip file contains a modified client script (gpslog.py) which implements local storing of the GPS data (NMEA data from the Quectel BG96 module):

  • gpslog.py : updated client script (stores the GPS data in the file logger.txt)
  • makekml.py : converts the logger.txt file to a KML version (logger.kml) that can be opened in Google Earth
  • logger.txt : saved GPS data
  • logger.kml : KML conversion of the saved GPS data

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