pcf8574 not working

[QDUNI]

Hi, I have an esp8266ex and a pcf8574at.
Now im trying to use the pcf8574 library but with no succes.
can you show me how I need to use it?

addr = 0x38

I want all the ports set to output so I can write them on and off.
I started with initializing every pin as output and then turn them all off. but with no succes.

pcf8574_gpio_write(&dev, 0, false); pcf8574_gpio_write(&dev, 1, false); pcf8574_gpio_write(&dev, 2, false); pcf8574_gpio_write(&dev, 3, false); pcf8574_gpio_write(&dev, 4, false); pcf8574_gpio_write(&dev, 5, false); pcf8574_gpio_write(&dev, 6, false); pcf8574_gpio_write(&dev, 7, false; pcf8574_port_write(&dev, 0);

[rangelflavio]

enable debug on i2c driver - make a loop to view and try each write address - some ic's come with another address

[QDUNI]

Do you have an example ?

[QDUNI]

If I use the Arduino library the address is 0x38... Im also able to use the pcf8574 with Arduino.
I want to make it work with esp open rtos, because of homekit