Does FreeRTOS need to use preemptive task scheduling when combined with LwIP for proper Ethernet operation?

[DBurr]

Hi, I'm just wondering if it's a requirement for FreeRTOS to use preemptive task scheduling when combined with LwIP for proper Ethernet communications. In the examples available with the STM32F7 Cube firmware all of the examples have preemptive task scheduling enabled. Also, what is the recommended task priority for LwIP's TCP thread? For example, most threads would have "Normal" priority so should LwIP's TCP thread be higher than this?

Thanks,

Doug