Fixing The GX Wifi Display Transport Error

Q&A and troubleshooting
21

I believe I’ve solved the TCP transport error I was having when my M8 android GX wakes up.

Lenovo M8 (4th gen) tablet

Cerbo GX v3.66

Android GX WiFi v1.01

I was previously using the cerbo gx built in access point. I had tried dhcp, a static ip on M8 as well as other things posted in this thread. The M8 would not consistently reconnect to the Cerbo after waking it up. I could go maybe a day at most if lucky and have M8 connect correctly after waking up.

After all the configurations I tried and looking at a few TCP packets, everything I was seeing made me think the problem was maybe with the built-in Cerbo GX access point. To try something different, I took an old wireless router I had and configured as access point for the RV. I disabled the built-in Cerbo GX access point and connected the Cerbo to the wireless LAN I created with the router. I configured a static IP on the Cerbo GX.

To ensure the Lenovo M8 and Android GX were back to factory defaults, I reset and reloaded the code. I left the Android gx configured to use DHCP.

I’ve now gone 2 weeks with no problems. I’ve let the M8 “sleep” for one day, 2 days and 3 days. No matter what interval I wake the M8, it immediately connects without issues when I touch the power button to wake it up.

This testing was done with no internet connectivity via the wireless router. A plus for me is I have now attached an inexpensive USB to Ethernet dongle to the router’s WAN port which allows me to quickly tether to my cell phone and check for Victron software updates.

22

Let’s call it a workaround for the Cerbo’s wifi not providing the strongest signal in the world. Make sure to power that router with a thirteen a dozen DC-DC buck converter straight from battery to make sure you can control your system during a power out (which is not accidentally the main reason to use the build in wifi to begin with).

23

That was one of the things I did when I went this route. The router had an AC adapter that I cut off and allowed me to wire directly to the fuse box fed by my batteries.
Thanks.

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