Generate the 11 character hash

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1. Build your keytool command. (I ran mine in bash, powershell might behave differently)

   Just replace com.sms_listener with your own package name. The default -alias for the debug keystore will always be androiddebugkey

   keytool -exportcert -alias androiddebugkey -keystore debug.keystore | xxd -p | tr -d "[:space:]" | echo -n <<<com.sms_listener>>> `cat` | sha256sum | tr -d "[:space:]-" | xxd -r -p | base64 | cut -c1-11
   

   OR

   ./sms_retriever_hash_v9.sh — package “com.your.packagename” — keystore /path/to/upload.keystore
   

   If you are using the debug keystore like me, it will ask for a password after you run the above command. The default password is: android

   A string will then be generated, something like this: gaMzAZ+vMRr

2. In the extended controls for Android Emulator

   Phone --> SMS Message

   <#> Your Example app code is: 123ABC78 /gaMzAZ+vMRr
   

   Of course replacing the 11 hash characters at the end with your own :)

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Bingo, it worked