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I have rpi zero w system with below spec.

system specifications: micro SD card slot, a mini HDMI port, two micro USB ports (one for power, one for USB), and 512MB of RAM. It has a single-core 700 MHz processor chip, similar to the Pi A+ and B+.

I am using zero in a iot project where less data is transferred hardly 10kb/day. My question is weather a 512mb single core cpu will handle mqtt server. I have already couple of servers running on it. currently my cpu usage goes 100%.

I have a microcontroller plugged in to rpi serial port to read/write, c file which reads/writes serial data consumes more that 60% of cpu.

And a python server running to display the information on web.

I am trying to plug mqtt for push notification to web.(Already tried Push API;service workers ,chrome needs trusted ssl certificates which is out of budget)

  • Yes, the Pi Zero will handle a mqtt server. – joan Jun 14 '18 at 13:01
  • How can a c file consume 60% of the CPU, and why is a microcontroller relevant? – Dmitry Grigoryev Jun 21 '18 at 7:29
  • @DmitryGrigoryev microcontroller is a wireless dongle communicating over zigbee protocol, when ever the dongle has received something, rpi should read it, for that i have a c file running in while loop in non blocking mode. I think while loop is eating away my cpu power. – 3bu1 Jul 27 '18 at 8:03
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As @joan has indicated in her comment, and as suggested in the following which were found by Googling Pi Zero as MQTT server, it would seem that the answer to your question is a firm "Yes":

  1. https://www.raspberrypi.org/forums/viewtopic.php?t=176689
  2. https://www.mickmake.com/post/mqtt-mosquitto-pi-zero-w-5-minutes-tutorial
  3. http://www.instructables.com/id/Using-a-Raspberry-PI-Zero-W-As-an-Access-Point-and/

I could go on - and on, and on... and on. It seems this is definitely "do-able". With all of this evidence, I would suggest you try it, and then post here if you have any specific questions. Also, the "Internet of Things" SE forum may be of interest to you as well.

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