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Re: [mosquitto-dev] MQTT-based voltage sensor
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- From: Josef Möllers <josef.moellers@xxxxxx>
- Date: Fri, 16 Oct 2020 08:55:40 +0200
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On 16.10.20 00:33, mohamed Abdulmajid
wrote:
hello everyone ,
i'm working on a voltage sensor that reads the input
voltage and sends it through MQTT to a mobile application . i
need help in the part of the code that is related to
publishing the readings to the mqtt broker .
this is my code :
That was an awful lot of code and it reached my site not properly
formatted:
client.begin(mqtt_server,
atoi(mqtt_port), net);
Also, I'm not sure
if I understand the idea of setting up an HTTP server to publish
MQTT topics.
My code just does
this at a fairly low level:
1) set up
parameters required like broker IP, broker port, broker
username, broker password
2) make a
measurement
3)
mosquitto_lib_init();
4) mosq =
mosquitto_new(client_id, true, NULL);
5)
mosquitto_publish_callback_set(mosq, my_publish_callback); //
my_publish_callback
just does "outstanding--;"
6)
mosquitto_username_pw_set(mosq, username, password)
7)
mosquitto_reconnect_delay_set(mosq, 5, 60, 1);
8)
mosquitto_connect(mosq, host, port, 60)
9)
mosquitto_publish(mosq, NULL, topic, strlen(m->value),
m->value, 1, 1); outstanding++;
10) while (outstanding
> 0) mosquitto_loop(mosq, -1, 1);
11)
mosquitto_disconnect(mosq);
12)
mosquitto_destroy(mosq);
Please read up on the
functions in the manual pages.
I usually wrap this
into one MQTT-specific source file with another source file
containing the sensor-specific code which returns a GList (*)
of measurements to publish. I have attached the sources (hehe
maybe somebody will point at bugs to me ;-) ). So when I need
an MQTT publisher for a new sensor, I just write the new
sensor-specific code and be done with it.
Josef
(*)https://developer.gnome.org/glib/stable/glib-Doubly-Linked-Lists.html
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