Ah! You must be using the Appium App. For full control over Appium you'll need to install by NPM or clone the source code. I don't think the App gives you the flexibility to do the things you want.
Full disclosure: I consider the App a nice "proof of concept" but I would never use it for a serious automation project. Too limiting!
I just took a look at the app. Under the Apple menu there is a checkbox for "Show iOS System Log". Have you tried that?
Hi, I am trying to get the real device console logs as well.
By setting the capability showIOSLog to true, will this automatically write the logs into my appium.log file? or do I have to do something extra. because right now I dont see those logs in the appium log.
Maybe some hint what else to do?
Thanks Juliane
Hello @Sonali Can you please share the solution for how to get the appium logs in the java code ?
Is there any way we can pull out the network calls or Api that are given invoked during the appium operations ?
@wreed tagging again in hopes of getting a response to my comment from 5-6 days ago 
I put both of the following capabilities in my project, and it showed the device console logs!
I am using 
desiredCapabilities.setCapability("realDeviceLogger", "/usr/local/lib/node_modules/deviceconsole");
desiredCapabilities.setCapability("showIOSLog", "true");