ethernet lwip re initialize at run time

[SITARAM]

im using stm32h743zi2 ethernet with udp . so i generated code and running in Kiel and ping working fine . BUT  how to  i re initialize lwip at run time .

i tried to reinitialize at run time but the ping is stopping after reinitializing . any body does this , hope u suggest me . thanks

[Pavel A.]

Ok now please calm down and explain slowly what's the problem?

[SITARAM]

i have generated stm32h743zi2 ethernet with udp   code using cube mx  . and i have created socket  , that is working properly and ping also working .  

my need is  ... when i send a command  like  "   HELLO11   "  i need to de initialize the lwip and after 5 sec i need to re initialize the lwip .   after reinitializing the lwip ping should work .

please check the attached txt file and let me know the solution plz... thanks...