WPJ428 + SIMCOM 8202G
=====================

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**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](./3D_model)
  - A Compex WPJ428 board - [wi-cat.ru](https://wikidevi.wi-cat.ru/Compex_WPJ428)
  - A Simcom 8202G modema - [official site](https://www.simcom.com/product/SIM8202GM2.html)
  - Some antennas, the setup is not definitive yet
    - Log-Periodic Dipole Array (LPDA) Antenna - Directional antenna LTE 800/1800/2600 MHz, MIMO, SMA - [wimo](https://www.wimo.com/en/antennas/gsm-lte-mobile-phone-antennas/60072) - [diff between yagi and lpda](https://powerfulsignal.com/blog/whats-the-difference-between-an-lpda-antenna-and-a-yagi-antenna/)
    - A cheap cross antenna - [amazon](https://www.amazon.fr/gp/product/B00BBKKULW/ref=ppx_yo_dt_b_asin_title_o04_s00)
    - Some small wifi-like antenna - [wimo, similar but different](https://www.wimo.com/en/antennas/gsm-lte-mobile-phone-antennas/60022-sma)

We try to document our journey here:
  - Guides
    - [Our own OpenWRT image for the WPJ428](./doc/compile.md)
    - [Flash OpenWRT on the WPJ428](./doc/flash.md)
    - [Manually connect a modem to the network](./doc/manual-modem.md)
    - [Our OpenWRT configuration](./doc/config.md)
  - 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](./doc/udp-df.md)
    - [Tracking the bandwidth bottleneck](./doc/bottleneck.md)
    - 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](./doc/logs.md)
  - Misc
    - [Bibliography](./doc/bib.md)
    - [Some mostly useless hacks](./doc/hacks.md)