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Month: May 2015

Linking the ESP8266 to a Raspberry Pi through MQTT

Linking the ESP8266 to a Raspberry Pi through MQTT

Published by Jan Penninkhof on May 25, 2015

In my previous blog post I have tried to explain why MQTT is the right protocol for IoT scenario’s. So it would be nice if the ESP8266 would be able to leverage this protocol as well. And it does! Over on the ESP forum, Tuan PM has been working on code to allow us to use the ESP boards as an MQTT client. The forum post is here and the wiki here. To get the ESP8266 to talk to the Raspberry Pi, I flashed Tuan PM’s MQTT examples with a few changes into the ESP and installed Mosquitto on my…

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Minimalist Cassandra VM using an OSv Unikernel

Minimalist Cassandra VM using an OSv Unikernel

Published by Jan Penninkhof on May 8, 2015

When I was living in Singapore I “accidentally” got involved in maintaining a community site for expats in Singapore. Till now, one in a while I’m still doing a bit of webmastering on the site as one of my side activities/hobbies. Use case As part of the activities on that site, there is a regular newsletter to all community members. Since the site was launched, approximately 350k members have signed up, but many of them have moved on to another country or changed their email address. At the same time, despite various anti-spam mechanisms the member-database is also getting polluted…

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