MQTT gpio switching info

[ambassadoro]

Hello,

there was the question how to drive a GPIO via MQTT:

Code: Select all

mosquitto_pub -d -t /esp3/GPIO/14 -m 0

The esp3 is the subscription-topic from the advanced section of the esp-configuration webpage: /%sysname%/#
Then the GPIO keyword and the number of the gpio that you want to switch. -m 0 is the payload. So this sets the gpio14 to 0. -m 1 makes it high.

This example works when you are on a local mosquitto server. Otherwise it needs username and password.

Here an example for a simple blinker with a 2 relais card (relais connected via transistors to 12 & 14):

Code: Select all

while true; do 
mosquitto_pub -q 1 -d -t /esp3/GPIO/14 -m "0";
mosquitto_pub -q 1 -d -t /esp3/GPIO/12 -m "1";
sleep 1;
mosquitto_pub -q 1 -d -t /esp3/GPIO/14 -m "1";
mosquitto_pub -q 1 -d -t /esp3/GPIO/12 -m "0";
sleep 1; done

When you have a real good power supply, this should run forever.

[tozett]

cool.
thanks a lot for the hint. i will try this..

maybe youve done similar with MQTT on linux and start a shell command through payload?


edit: i found this... look good to me (even python instead of bash, but on linux no prob ...)
https://github.com/jpmens/mqtt-launcher

[ambassadoro]

With the shell-command this is useful for test purpose. For more automation I am playing around with Home Assistant. It supports mqtt very well and looks much more promising to me than fhem.
Have fun

[tozett]

i will try this:
https://home-assistant.io/components/shell_command/

and must define shell-commands to send from MQTT/Homeassistant.io with groupswrite(eibd) to KNX..

coool, thanx

edit: set up a debian8 vmware, now running homeassistant..looks promising..

[tozett]

... subscription-topic from the advanced section of the esp-configuration webpage: /%sysname%/#
... -m 0 is the payload. So this sets the gpio14 to 0. -m 1 makes it high.

hi,
i dont see realy clear if i can also send PWM level to GPIOs as a payload?
what payload-commands are possible?
same as http requests?
did not find the right place in the code,
but that must be me
a hint may help`....

edit: found something from the devs about PWM here:
http://www.esp8266.nu/forum/viewtopic.p ... 3601#p3601

[wutu]

Yes, it is possible.
I use:
esp GPIO:
<systopic>/pwm/<pin> with payload: 0-254
pca9685 GPIO
<systopic>/pcapwm/<pin> with payload: 0-4094

[HarpieC]

another question:

is there a way to send a pulse of some milliseconds to the gpio pin via MQTT too. I try to avoid http and have all communication via MQTT because it is easier to debug via MQTT spy or MQTT.fx

It's working via http:

http://<ESP IP address>/control?cmd=Pulse,<pin>,<state>,<duration>

Thank you for your support.
Chris

[adibacco]

Looking into the code or at this page http://www.letscontrolit.com/wiki/index ... _Reference you will find that you can publish a message like pulse,12,1,250 to topic cmd