XBee 868LP - Don't wake up after sleep mode 4

I’m trying to set XBee to sleep mode 4 in order to save power.

My application has to take a sample from a sensor, send it over Xbee and then go to sleep for about 10 seconds.

So, I think that Sleep Mode 4 is what I need.
I’ve setted up the module SM, ST and SP parameters but I don’t understand what happen.

Here the code:

	temperature = sonda_i2c_readTemperature();

	(void)xbee_cmd_simple(&xdev, "SP", 1000); //10sec
	(void)xbee_cmd_simple(&xdev, "ST", 0x1F40); //wake up for about 8s then go to sleep again
	(void)xbee_cmd_simple(&xdev, "SM", 4); //set the module in SleepMode 4
	for (;;) {
		/* Nothing to do... 
		 * Everything is done in the periodic task

After some seconds the module seems to go to sleep (power go down from 35mA to 12mA) but it don’t wake up after 10second as I need.

Is there something wrong in the code?

Please help.

Thank you

Check your CE value on all of the nodes. You do not use the same CE value for an Asynchronous sleep as you do for synchronous sleep.