emulate keypress using python for emulationstation

[lorigio]

Hi i’m trying to control emulationstation using python as keyboard. I have this code

import time
from evdev import uinput, ecodes as e

def buttonEventHandler ():
   print "keypress"
   with uinput.UInput() as ui:
      ui.write(e.EV_KEY, e.KEY_UP, 1)   
      ui.syn()     
      time.sleep(5)
      ui.write(e.EV_KEY, e.KEY_SPACE, 0)
      ui.syn()

def main():
     buttonEventHandler()
     while True:
         time.sleep(10)

if __name__=="__main__":
    main()
   

It works only if i first plug a real keyboard then i can disconnect the keyboard and the script starts working and i can see emulationstation reacting when i send the keys from the script. How can i make it working without plug a keyboard first?

I also tried with a modified version of retrogame but nothing

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <sys/mman.h>
#include <linux/input.h>
#include <linux/uinput.h>

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

// Retrogame normally uses /dev/uinput for generating key events.
	// Cupcade requires this and it's the default.  SDL2 (used by
	// some newer emulators) doesn't like it, wants /dev/input/event0
	// instead.  Enable that code by changing to "#if 0" above.
    int fd;
    struct input_event     keyEv, synEv; // uinput events
    
	if((fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK)) < 0)
		err("Can't open /dev/uinput");

	struct uinput_user_dev uidev;
	memset(&uidev, 0, sizeof(uidev));
	snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "retrogame");
	uidev.id.bustype = BUS_USB;
	uidev.id.vendor  = 0x1;
	uidev.id.product = 0x1;
	uidev.id.version = 1;
	if(write(fd, &uidev, sizeof(uidev)) < 0)
		err("write failed");
	if(ioctl(fd, UI_DEV_CREATE) < 0)
		err("DEV_CREATE failed");

	// Initialize input event structures
	memset(&keyEv, 0, sizeof(keyEv));
	keyEv.type  = EV_KEY;
	memset(&synEv, 0, sizeof(synEv));
	synEv.type  = EV_SYN;
	synEv.code  = SYN_REPORT;
	synEv.value = 0;
   
    keyEv.code = 97;

    for(int i=1; i>= 0; i--) { // Press, release
        keyEv.value = i;
        write(fd, &keyEv, sizeof(keyEv));
        usleep(10000); // Be slow, else MAME flakes
        write(fd, &synEv, sizeof(synEv));
        usleep(10000);
    }
    
    while (1 == 1)
    {}
    
    
    ioctl(fd, UI_DEV_DESTROY); // Destroy and
    close(fd);                 // close uinput    
}

I used 97 on keyEv.code because i have
<input name=”a” type=”key” id=”97″ value=”1″ />
on es_input.cfg is it right?

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