wpj428/README.md

WPJ428 + SIMCOM 8202G

We see this project as a way to assess how well we can regain control/understanding on our NR5G/LTE routers.
And for now the answer seems to be "very little".

Our case study is a NR5G router as the main Internet access point in a place where we have no signal on our cellphones. We

Our project is currently made of the following physical parts:

• A custom made case that is 3D printed - Download files
• A Compex WPJ428 board - wi-cat.ru
• A Simcom 8202G modema - official site
• Some antennas, the setup is not definitive yet
  • Log-Periodic Dipole Array (LPDA) Antenna - Directional antenna LTE 800/1800/2600 MHz, MIMO, SMA - wimo - diff between yagi and lpda
  • A cheap cross antenna - amazon
  • Some small wifi-like antenna - wimo, similar but different

We try to document our journey here:

• Guides
  • Our own OpenWRT image for the WPJ428
  • Flash OpenWRT on the WPJ428
  • Manually connect a modem to the network
  • Our OpenWRT configuration
• Problems we encountered
  • Dimensions for the board in the datasheet are wrong
  • Ethernet ports are not configured at boot
  • Signal is not optimal with an antenna under the roof
  • The UDP+Don't Fragment bug
  • Tracking the bandwidth bottleneck
  • Our modem never connects on NR5G Non StandAlone (NSA) aka E-utran New radio Dual Connectivity (EN-DC)
  • Some logs/data/info about our hardware
• Misc
  • Bibliography
  • Some mostly useless hacks