I'm not sure what you mean by nodemcu issue, there is no functionality missing there, I think. I wanted to ask you to open issue on my lwip github project about missing hold/unhold functions in my lwip implementation. Please specify where I can get the code you are trying to compile and paste the error log about missing hold/unhold symbols. I will fix this when I have time and you will be notified about this.
I'm not sure what you mean by nodemcu issue, there is no functionality missing there, I think. I wanted to ask you to open issue on my lwip github project about missing hold/unhold functions in my lwip implementation. Please specify where I can get the code you are trying to compile and paste the error log about missing hold/unhold symbols. I will fix this when I have time and you will be notified about this.