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

XBee & XBee Gateway XBee Programamble (S2C & 900 HP)
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1

Hi,
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

2

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.