# Limitations

Source: [https://docs.qualcomm.com/doc/80-73442-1/topic/limitations.html](https://docs.qualcomm.com/doc/80-73442-1/topic/limitations.html)

This chapter lists the limitations for the QCC740.OR.1.0 CS 2.4
            (2.0.109) SDK release.

- Enabling Wi-Fi AP mode and STA mode on different channels leads to poor performance
                and connection loss, as there is only one 802.11 MAC hardware unit.
- Activating BLE scan/BLE mesh with a high duty cycle results in degraded Wi-Fi
                performance and connection loss, due to the shared antenna between BLE and
                Wi-Fi.
- Disabling IRQs can diminish the CPU’s responsiveness to the 802.11 protocol stack
                and BLE/Bluetooth events, potentially causing connection and packet loss. Avoid
                disabling IRQs for more than 1 ms.
- In FreeRTOS, high priority tasks are reserved for protocol stack tasks. Therefore,
                don't assign a priority higher than 25 to your task unless you are certain of the
                implications. This includes maintaining simplicity in the callbacks of FreeRTOS
                timers, which operate at priority 31.
- QCC74x Wi-Fi OTBR is a single chip solution which makes Wi-Fi and IEEE 802.15.4
                share a same RF on time slot using Wi-Fi power saving mode. When more sleepy end
                devices (for example, 5) join as OTBR child using CSL(Coordinated Sampled
                Listening), QCC74x may fail to allocate time slots for all these sleepy end devices
                and lead to link loss, need to limit the number of sleepy end devices joining as
                OTBR child. Sleepy end devices can still join through other thread routing
                devices.

Last Published: May 14, 2026

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