Start wifi network after force sleep

[rith87]

I'm having difficulty trying to start a wifi network after a force sleep. Specifically, I'm trying the following sequence of events:

1. Sleep wifi

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    wifi_set_opmode(NULL_MODE);         
    wifi_fpm_set_sleep_type(MODEM_SLEEP_T);
    wifi_fpm_open();
    wifi_fpm_do_sleep(FPM_SLEEP_MAX_TIME);
   

2. Wake up wifi

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    wifi_fpm_do_wakeup();
    wifi_fpm_close();

ESP returns:

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fpm wk err: pm is open
fpm close 3

3. Start wifi network

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    wifi_set_opmode(STATIONAP_MODE);
   

ESP returns:

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mode : sta(5c:cf:7f:16:59:b6) + softAP(5e:cf:7f:16:59:b6)
add if0
add if1
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
bcn 100

However, the callback from wifi_set_event_handler_cb() is never called. And the ESP does not host the wifi network. Also, even if I add a system_restart() between (2) and (3), the ESP still fails to host the wifi network. The ESP hosts the wifi network fine if the force sleep code is omitted on a hard reset.

Any ideas?