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2.3 KiB
2.3 KiB
ESP-KNX-IP
This is a library for the ESP8266 to enable KNXnet/IP communication. It uses UDP multicast on 224.0.23.12:3671. It is intended to be used with the Arduino platform for the ESP8266.
How to use
The library is under development. API may change multiple times in the future.
API documentation is available here
A simple example:
#include <esp-knx-ip.h>
const char* ssid = "my-ssid"; // your network SSID (name)
const char* pass = "my-pw"; // your network password
config_id_t my_GA;
config_id_t param_id;
int8_t some_var = 0;
void setup()
{
// Register a callback that is called when a configurable group address is receiving a telegram
knx.register_callback("Set/Get callback", my_callback);
knx.register_callback("Write callback", my_other_callback);
int default_val = 21;
param_id = knx.config_register_int("My Parameter", default_val);
// Register a configurable group address for sending out answers
my_GA = knx.config_register_ga("Answer GA");
knx.load(); // Try to load a config from EEPROM
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
}
knx.start(); // Start everything. Must be called after WiFi connection has been established
}
void loop()
{
knx.loop();
}
void my_callback(message_t const &msg, void *arg)
{
switch (msg.ct)
{
case KNX_CT_WRITE:
// Save received data
some_var = knx.data_to_1byte_int(msg.data);
break;
case KNX_CT_READ:
// Answer with saved data
knx.answer1ByteInt(msg.received_on, some_var);
break;
}
}
void my_other_callback(message_t const &msg, void *arg)
{
switch (msg.ct)
{
case KNX_CT_WRITE:
// Write an answer somewhere else
int value = knx.config_get_int(param_id);
address_t ga = knx.config_get_ga(my_GA);
knx.answer1ByteInt(ga, (int8_t)value);
break;
}
}
How to configure (buildtime)
Open the esp-knx-ip.h
and take a look at the config options at the top inside the block marked CONFIG
How to configure (runtime)
Simply visit the IP of your ESP with a webbrowser. You can configure the following:
- KNX physical address
- Which group address should trigger which callback
- Which group address are to be used by the program (e.g. for status replies)
The configuration is dynamically generated from the code.