Wondering why people fork git projects with the clear intention not to contribute, rather than just starring them?
Separate network for your IoT devices at home
I am curious if you folks have a separate network for your IoT devices at home? Bonus read on the subject: https://robpickering.com/ubiquiti-configure-micro-segmentation-for-iot-devices/ The poll results are interesting. Looks like 80% of my tech-savvy followers do not have a separate network for their IoT devices, which means either they DIY all of their IoT hardware andβ¦
Arduino code in production
I am frequently contacted by folks who were advised to use Arduino to build commercial product and are now running into the full spectrum of issues related to using a rapid prototyping platform in production. Someone's giving them the wrong advice and that costs a lot. Also using Arduino code means all of your objectβ¦
128 KB limit for MQTT payload size for AWS IoT
TIL of the 128 KB limit for MQTT payload size for AWS IoT. Any publish request that contains payload larger than this limit will be rejected and result in a disconnect. Kind of odd, makes it difficult to transport large payloads e.g. frames from cameras or OTA files over AWS IoT.
MQTT rate limiter middleware
Working on MQTT rate limiter middleware, it will add an extra layer of security to my already oversecured broker.
JSON based access policies to my Mosca-based MQTT broker

Implemented JSON based access policies to my Mosca-based MQTT broker, decision to allow or deny publish/subscribe is now based on the presented client certificate's CN/O/OU/L fields. I think it is pretty safe to say I now run miniature AWS IoT clone π
ESP32 OTA rollbacks
Implemented ESP32 OTA rollbacks if the new firmware crashes within 45 seconds of first boot, doesnt manage to connect to MQTT or the device enters degraded operating mode due to failed hardware initialization. This gives me a peace of mind when pushing mass OTA updates. #IoT
Continuous Delivery setup for ESP32 IoT projects
Made a short video on my Continuous Delivery setup for ESP32 IoT projects using Node-RED https://youtu.be/paC_rVziIMQ #IoT #MQTT #OTA #ESP32
Folks actually think like that

This made me laugh, I have seen folks actually think like that #startup #ideas #dilbert
Provisioning ESP32 devices for mutual TLS authentication
Just recorded a new video: Provisioning ESP32 devices for mutual TLS authentication for MQTT using own PKI https://youtu.be/7qTT9EPCdCw #IoT #mTLS #MQTT #security #PKI #DIY #eclipse
How-to video on how to use self-created CA
Made a "how-to" video on how to use self-created CA to secure Node-RED installation with mutual TLS authentication in 12 minutes: https://www.youtube.com/watch?v=oRCpXEj236s&feature=youtu.be #IoT #nodered #tls #mtls #security
Jupiter next to the moon

Jupiter quite visible today, just next to the moon where I live. Feels alien to see it like this..
AWS IoT pricing calculator

Checking an AWS IoT pricing calculator, running a 10K IoT fleet costs $1.8K per year. This is not insignificant. Link to the calculator: https://d1.awsstatic.com/IoT/assets/AWS_IoT_Core_Pricing_Calculator.fcc37410fa03431c28b59d8509f1b4e370c88402.xlsx
Node-RED with mutual TLS authentication

Secured my #Node-RED with mutual TLS authentication through my own CA and self-generated certificates; I have to present a client certificate in order to be allowed to use Node-RED.
My dog meets Google’s AR tiger in the garden

My dog meets Google's AR tiger in the garden.. try it yourself, google for "tiger" on your phone, then "view in 3D"->"view in your space"
Basic PKI PoC
I need a node.js guru volunteer to work with me on creating basic PKI PoC that provisions #ESP32 devices with client certificates; node-forge looks right for the purpose. I have the complete solution architecture figured, just need a node.js guru that can code it for free π Couple volunteers already, thanks @eliofilipe and @MrQinEL ;β¦
x.509 certificates to dedicated ESP32 partitions
I now load x.509 certificates to dedicated ESP32 partitions rather embedding into the code via COMPONENT_EMBED_TXTFILES; This helps decouple the code from provisioning the device with CA and client certificate+key; Still working on PKI to provision the certificates at flash time
Wallet with IDs, credit cards
Saw someone drop his wallet while entering a shop (pretty full with cash btw) and ran up to him to return it. Feels good to help, I have been in a position where I've lost wallet with IDs, credit cards and know what it means..
mTLS to secure IoT solutions

Sharing some thoughts on using mTLS (mutual TLS authentication) to secure IoT solutions in a blog post: https://harizanov.com/2019/06/using-mtls-to-secure-iot-solutions/
30 active IoT devices at home
Counted 30 active IoT devices at home, 90% of them created by me. What's your count?
Run a C Language Interpreter on Your ESP32

This is pretty interesting: Run a C Language Interpreter on Your ESP32 https://www.codeproject.com/Articles/5061494/Run-a-C-Language-Interpreter-on-Your-ESP32
MQTT certificate based mutual authentication

Implemented #MQTT certificate based mutual authentication for my home automation with access policies for publish/subscribe, much like Amazon AWS #IoT, only #DIY . It is now much more secure #esp32 #mosca Added certificate revocation list functionality. Took extra effort to make it work without MQTT broker restart. Next is profivioning API for the nodes
ESP32-S2 secure Wi-Fi MCU
@EspressifSystem I'd love to get my hands on the #ESP32-S2 , count me in for a tester https://www.espressif.com/en/news/espressif-announces-%E2%80%A8esp32-s2-secure-wi-fi-mcu
Come see me

Come see me #security #infosec #passwords
DIY sliding door opener
A short video blog post of my DIY sliding door #Iot opener https://harizanov.com/2019/05/iot-sliding-door-opener/ https://youtu.be/BPzyOmaaLY0 #esp8266 #DIY #MQTT #smarthome #homeautomation
The Dunning-Kruger effect

The Dunning-Kruger effect is a real thing, I get a reminder every now and then
Demo of pairing a remote wireless sensor
Demo of pairing a remote wireless sensor, RFM69 based, with main control hub https://youtu.be/r7twp9cV2z4 #IoT #ESP32 #rfm69 #homeautomation
Self-made esp8266 gate controller

Installed a self-made esp8266 gate controller with magnetic switch status sensor, I can now open/close/read the statate of the gate from anywhere. #IoT #esp8266
Pull-ups on I2C lines

Forgot to add pull-ups on I2C lines, retrofitted resistors save the day
2.4GHz vs 433MHz range tester

Wrote a 2.4GHz vs 433MHz range tester: sending espnow 2.4GHz and RFM69 @ 433MHz from master to a slave node. 433MHz range is much better from what I can see but I am comparing apples to pears here..
Touch GUI to control my paradox home alarm

Working on touch GUI to control my paradox home alarm
Human-Machine Interface (HMI) modeling and implementation
New post: Human-Machine Interface (HMI) modeling and implementation using event-driven finite-state machines https://wp.me/pawL3e-1i8
