[LEDE-DEV] Serial data getting lost - bug or a feature?

Piotr Dymacz pepe2k at gmail.com
Tue Oct 17 04:08:18 PDT 2017

Hi Valent,

On 16.10.2017 22:04, Valent Turkovic wrote:
> Hi,
> I'm working with Lede on ar71xx platform (Carambola2 wifi module) to
> gather sensor data over serial, save it and transfer it to "could".
> Previous firmware was based on OpenWrt Chaos Calmer but latest one is
> based upon Lede 17.01.01. I'll test it also with 17.01.03 soon.
> What I have discovered is that now with using Lede sometimes there are
> missing characters while reading data from serial connection.
> Data is not constantly being read, but sensor device is logging data
> usually for 8 hours and then data is read via serial in one big
> "download". During these downloads I have never seen a character go
> missing while Chaos Calmer was used.
> What was even stranger is that sometimes I did get these "bad logs"
> (ie ones with few missing characters) but sometimes log download went
> perfectly!
> After some head scratching and troubleshooting I managed to reproduce
> this "bug" 100% and it was due to wifi! But only if wifi was enabled
> and not being used!
> So if radio was enabled, in sta mode but not connected to AP errors
> would happen! It I would disable wifi or if radio was associated with
> AP then there would be no errors during reading data from serial
> connection.
> Is there any explanation for this behaviour? Is this a bug or a
> feature? Is there any change between OpenWrt CC version and Lede that
> could explain this?

Are you using AR9331 built-in UART or some external, USB to UART adapter?


> Thanks in advance for any insight and answers,
> Valent.
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