WiringPi code for sending signals to my 433MHz remote controlled wall sockets labeled with "unitec EIM-209 48111". The protocol is quite different from other remotes, the remote unit sends each code in multiple different ways and also cycles between 4 different codes for each button. I have not spent the time to figure out how/if the address and…

unitec_send.c

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>

#define PIN 8
#define PERIOD 1500
#define SHORT 440 //short pulse == 1 in rtl_433 output
#define LONG 940
#define LONGLOW 1140
#define LONGHIGH 2940
#define PAUSE 7080
#define CORRECTION -70

//values received with rtl_433 -p 75 -R0 -X "unitec:OOK_PWM:440:940:1400:2000"
static unsigned int codes[32] = {
  0x1aa373, 0x18ca43, 0x1d8583, 0x156cd3, //A OFF
  0x1bd153, 0x165f93, 0x11b4e3, 0x1ee7a3, //A ON
  0x1f7d6a, 0x19282a, 0x1406ba, 0x139b3a, //B OFF
  0x1c301a, 0x1212fa, 0x1749ca, 0x10fe0a, //B ON
  0x11b4e1, 0x1ee7a1, 0x1bd151, 0x165f91, //C OFF
  0x1d8581, 0x156cd1, 0x1aa371, 0x18ca41, //C ON
  0x1212f8, 0x1749c8, 0x10fe08, 0x1c3018, //D OFF
  0x1f7d68, 0x192828, 0x1406b8, 0x139b38  //D ON
};

void delayUs(unsigned int us) {
  delayMicroseconds(us + CORRECTION);
}

void sendBit(unsigned int bit) {
  digitalWrite(PIN, HIGH);
  delayUs((bit & 1) ? SHORT : LONG);
  digitalWrite(PIN, LOW);
  delayUs((bit & 1) ? (PERIOD - SHORT) : (PERIOD - LONG));
}

//send 24 bits, MSB first
void sendCommand(unsigned int command) {
  for (int j = 23; j>=0; j--) {
    sendBit(command >> j);
  }
}

void sendPacket(unsigned int command) {

  sendBit(1);
  delayUs(LONGLOW);
  sendCommand(command);

  sendBit(1);
  delayUs(LONGLOW);
  sendCommand(command);

  sendBit(1);
  delayUs(LONGLOW);
  sendCommand(command);

  sendBit(1);
  delayUs(LONGLOW);
  sendCommand(command);

  digitalWrite(PIN, HIGH);
  delayUs(LONGHIGH);
  digitalWrite(PIN, LOW);
  delayUs(PAUSE);
  sendCommand(command);

  digitalWrite(PIN, HIGH);
  delayUs(LONGHIGH);
  digitalWrite(PIN, LOW);
  delayUs(PAUSE);
  sendCommand(command);

  digitalWrite(PIN, HIGH);
  delayUs(LONGHIGH);
  digitalWrite(PIN, LOW);
  delayUs(PAUSE);
  sendCommand(command);

  digitalWrite(PIN, HIGH);
  delayUs(LONGHIGH);
  digitalWrite(PIN, LOW);
  delayUs(PAUSE);
  sendCommand(command);

  delay(50);
}

int main (int argc, char *argv[]) {

  wiringPiSetup();
  pinMode(PIN, OUTPUT);

  if (argc == 3) {
    unsigned long channel = strtoul(argv[1], NULL, 10);
    unsigned long value = strtoul(argv[2], NULL, 10);

    printf("channel %lu %s\n", channel, value == 1 ? "on" : "off");

    sendPacket(codes[(channel * 8) +     (4*value)]);
    sendPacket(codes[(channel * 8) + 1 + (4*value)]);
    sendPacket(codes[(channel * 8) + 2 + (4*value)]);
    sendPacket(codes[(channel * 8) + 3 + (4*value)]);

    return 0;
  }

  printf("Usage: %s [0|1|2|3] [0|1] to turn channel 0-3 off or on\n", argv[0]);
  return 1;
}