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Custom Code~

To add your own custom code in the src/custom directory, you need to enable #define HASP_USE_CUSTOM 1 in your include\user_config_override.h.

You can start adding code by copying the template files as my_custom.h and my_custom.cpp. This will add the custom\my_custom.h header to openHASP compilation and call the defined functions from the main loop.

Available Hooks~

Create a file src/my_custom.h that defines all these custom hooks:

src/my_custom.h
#ifndef HASP_CUSTOM_H
#define HASP_CUSTOM_H
#if defined(HASP_USE_CUSTOM)

#include "hasplib.h"

void custom_setup();
void custom_loop();
void custom_every_second();
void custom_every_5seconds();
bool custom_pin_in_use(uint8_t pin);
void custom_get_sensors(JsonDocument& doc);
void custom_topic_payload(const char* topic, const char* payload, uint8_t source);

#endif // HASP_USE_CUSTOM
#endif // HASP_CUSTOM_H

The custom_setup() function is called at boot. Use it to initialize variables, load libraries, configure GPIOs or sensors.

The custom_loop() function is called every itteration of the main loop, much like the Arduino loop() function. It is very important to make the execution of this function very efficient without using any blocking code or delay(). Otherwise it will have an impact on the UI responsiveness and/or other time-sensitive code.

custom_every_second() and custom_every_5seconds() functions are called every second and every 5 seconds respectively. You can use these to execute non-time-critical code.

The function custom_pin_in_use() is used to indicate that a pin is in use. Return true if the pin used by your custom code.

Use custom_get_sensors() to add a sensor key and value to the periodic sensor MQTT messages. The function is called every 30 seconds by default, but the teleperiod interval can be changed by the user. The doc variable is passed so you can add your JSON object too it. (see below)

With custom_topic_payload() you can receive custom topic & payload messages. You can use the value of the topic and payload variables to set LVGL attributes or perform custom actions.
source indicates the module from wich the command is received. (TAG_MQTT, TAG_CONS, TAG_TELN, TAG_HTTP, ...)

Customize functions~

In src/my_custom.cpp you add the code to execute for each of the functions declared above.

Setup~

We keep a variable for tracking the last blink time.

my_custom.h
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#include "hasplib.h"

#if defined(HASP_USE_CUSTOM) && true // <-- set this to true in your code

#include "hasp_debug.h"
#include "custom/my_custom.h"

unsigned long last_blink = 0;
bool blink_state = LOW;

void custom_setup()
{
    // Initialization code here
    last_blink = millis();
    pinMode(LED_BUILTIN, OUTPUT);
    randomSeed(millis());
}

Loops~

Next, check the time past since the last blink. This should execute very fast, do not use delay() or any blocking code.

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void custom_loop()
{
    // Non-blocking code here!
    if(blink_speed && (millis() - last_blink > blink_speed)) {
        if (blink_state==LOW) {
            blink_state = HIGH;
        } else {
            blink_state = LOW;
        }
        digitalWrite(LED_BUILTIN, blink_state);
        last_blink = millis();
    }
}

We don't execute code at fixed intervals, so leave these functions blank:

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void custom_every_second()
{
    // Unused
}

void custom_every_5seconds()
{
    // Unused
}

Declare pins~

We need to tell the firmware which custom pins we have used:

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bool custom_pin_in_use(uint8_t pin)
{
    switch(pin) {
        case LED_BUILTIN:  // Custom LED pin
        case 6:  // Custom Input pin
            return true;
        default:
            return false;
    }
}

Report Sensors~

Here we can add data to the sensors MQTT messages that are sent periodically. You can add a simple Key-Value pair or a more complex JSON object if needed.

void custom_get_sensors(JsonDocument& doc)
{
    JsonObject sensor = doc.createNestedObject(F("Temperature"));  // Add Key
    sensor[F("Temperature")] = random(256);                        // Set Value
}

Debug Output~

By including #include "hasp_debug.h" we can also utilize LOG_*() functions to print debug output to the console:

  • LOG_VERBOSE(TAG_CUSTOM, message [, args])
  • LOG_NOTICE(TAG_CUSTOM, message [, args])
  • LOG_TRACE(TAG_CUSTOM, message [, args])
  • LOG_ERROR(TAG_CUSTOM, message [, args])

MQTT Output~

Use dispatch_state_subtopic(topic, payload) to send an MQTT message and payload to hasp/<plate>/state/topic.

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void custom_every_5seconds()
{
    LOG_VERBOSE(TAG_CUSTOM, "%d seconds have passsed...", 5);
    dispatch_state_subtopic("my_topic", "{\"test\":123}");
}

Last update: 2022-09-18