ESP32/ESP8266 Wi-Fi Attacks

Post by fyfy18 » Fri, Sep 06, 2019, 4:09 AM UTC

zaarn wrote: post #136

fyfy18 wrote: post #120

Earlier quoted context omitted.

Can they really last that long (on their own)? I looked into this when the ESP8266 first became popular maybe 4 years ago as I wanted to build WiFi temperature and humidity sensors. My calculations were that a set of AAA rechargable batteries (~2000mAh) would last a few days at most, with the device in deep sleep most of the time and waking up every 10 mins to take a reading and send it over WiFi. Right now I'm looki…

Personal experience: I have a ESP32 that runs as a sort of weather station. It has a ~2000mAh battery and lasts almost 2 months, getting a data point once every 30 minutes. That is using the ESPHome to program it. Even at once every 10 minutes, it should manage almost 3 weeks without requiring a recharge. Some options that definitely help is to quicken the Wifi reconnect. ESPHome has options to disable AP scanning an…

Ah ha, that's good to know! Yeah in my case I had a small solar panel (a few quid of eBay, I guess around 1W) which was able to power it through a British winter (it did get direct sunlight though). I had some rechargable AAA batteries and just wired the solar panel in parallel with them.

After a few months it stopped working, I think some moisture got in and the DHT11 failed.

Post by ospider » Fri, Sep 06, 2019, 5:32 AM UTC

microtonal wrote: post #47

stefan_ wrote: post #21

Earlier quoted context omitted.

Uhh, their WiFi implementation is hacked-together old open source code distributed as statically linked binary blobs. And that is just the software part, there isn't much visibility into the silicon side..

Plus they are a Shanghai-based company and can be compelled by the Chinese government to place hardware back doors. (They are great for makers though, very affordable, lots of features.)

> Plus they are a Shanghai-based company and can be compelled by the Chinese government to place hardware back doors.

Plus Broadcom is a US-based company and can be compelled by the US government to place hardware back doors.

Re: ESP32/ESP8266 Wi-Fi Attacks

Re: ESP32/ESP8266 Wi-Fi Attacks