The default maximum TCP connection number of AT firmware is 5; MS11SF11 supports 16 TCP connections, which can be modified in menuconfig. 

Specific step as bellows:

1.Component config—> AT—> (16)AT socket maximum connection number

2. LWIP—> (16)Max number of open sockets

1. Please check whether the download line is connected properly;

 2. Please make sure the module has entered the download mode (GPIO2, GPIO8 pull-up, GPIO9 pull-down, and then enable EN)

WiFi 6, also known as 802.11ax, can operate on both the 2.4 GHz and 5 GHz frequency bands. However, the exact frequency used by a WiFi 6 network can vary depending on the device and the network configuration.

In the 2.4 GHz band, WiFi 6 uses frequencies between 2.400 and 2.500 GHz, while in the 5 GHz band, it uses frequencies between 5.150 and 5.925 GHz.

One of the advantages of WiFi 6 is that it can operate on wider channels, up to 160 MHz wide, which can help increase the data transfer rates and improve overall network performance.

The Voltage is 3.3V; supply current is more than 500mA.

Most cell phone Bluetooth interface can only show the classic Bluetooth. However, our module belongs to BLE (low power Bluetooth), so it may not search. If you need to test, you can download the nrf connenct software, open the cell phone Bluetooth and then scan in the APP.

Remove the build file from the folder and recompile it.

No,  MS11SF11 has no SDIO.

The default firmware uses the UART interface for communication. The ESP-AT file can also be reconfigured and recompiled to set up SPI interface communication.