Hi,
A few other things you can check:
1) Make sure you are connected to the correct Antenna connector (depends on what module you are using)
2) Try using the tx_cont command and check if you see any packets on the Spectrum Analyzer (Make sure to set it to the correct channel)
3) In normal mode (not PLT) - can do you have any transmission / receive on the Wi-Fi module (i.e. doing a Wi-Fi scan and see adjacent APs)
Regards,
Barak