EM7565 Wake Host on SMS message not working


I am attempting to use the AT!CUSTOM=“WAKEHOSTEN”,1 setting to configure an EM7565 module to wake up our embedded Linux i.MX6 host upon the receipt of an SMS message, however I do not see any change on the WAKE_ON_WAN# line (pin 23) when we send the module an SMS text. I have tested this in both normal power with AT+CFUN=1 and low power with AT+CFUN=0. The WAKE_ON_WAN# is default pulled up to 3.3V by external circuitry.

We also enabled SMS notification using AT+CNMI=1,1,0,0 and we notice that there is no +CMTI asynchronous notification of an incoming SMS in low power mode. When we switch back to normal power we do see the +CMTI messages after about 15 seconds. Our system design depends on the EM7565 module being able to receive an SMS in low power mode and wake up the Linux host.

We are currently using Release 11 of the AT&T certified firmware. Our FAE indicated that the WAKEHOSTEN customization was supported in this firmware. Is there some additional configuration setting that we are not aware of?

Appreciate your support,