Broadcast SSID in Ad hoc Mode


I try to use WiEM modules to create Ad Hoc mode network. In order to join each other, modules need to get SSID to join with. If I use an AP, I can join modules together to create Ad hoc network. However, without AP, there is problem as no SSID is found. I tried to set wln_bss=WLN_BSS_IBSS, but the module still doesn’t broadcast SSID. Does anyone know how to broadcaster SSID on digi module? Thank you.

Ps: NetOS 7.1 platform is used.