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@alowhum sorry, I don't understand the first benefit. Serial output is available already in preHwInit(), which is called before setup(). present() is also called after preHwInit(), so Serial is available there as well.
For the second benefit, my impression is that you are doing stuff (reading eeprom) in setup() that could be done in present() instead.
Thanks @cvdenzen
Adding reference link in case someone needs to check it later: https://github.com/mysensors/MySensors/commit/98355b2d0b68190a87c3ac76698014adb58fc882#diff-407bf395289c3cbd3d7728909c25b3adR186
Based on the discussion in https://github.com/mysensors/MySensors/issues/927 I think that one big problem with calling present() from inside setup() is that the transport might not be ready to send messages yet. So trying to send messages might mess up all sorts of things.
If you for example need to initialize a onewire bus and query the number of devices before presenting, presenting in presentation() and initializing in setup() makes for clearer separation. Example: https://www.mysensors.org/build/temp
I have not considered this. Maybe digging through the code can yield an answer. A downside would probably be that the sketch would become less easy to read and harder to understand, troubleshoot and maintain. What would the benefit be?
The technical difference is that V_TRIPPED = 16 and V_ARMED = 15. Controllers decide how they show/use different types.
Welcome to the MySensors forum @shahdad-marri
Can you share some more information?
What material is the pipe made of?
How large is the pipe?
Can you open and place a sensor inside the pipe?
Is the water drinking water, sewage or something else?
Is the pipe oriented vertically or horizontally?
Will the pipe either be completely full or completely empty, or can there be varying degrees of water in it?
Does the sensor need to be battery powered, or is there access to mains power?
Do you have a price range in mind?
@spanners I told you it would make a big difference 
Thanks for reporting back!
@spanners said in Arduino Uno with Ethernet Shield W5100 not working:
I have the code to disable the the SD reader in setup() already. Haven't tried in before() yet.
Please do so. It makes a big difference!
@jimmy-loyens these threads might be of interest
https://forum.mysensors.org/topic/709/indoor-ble-location-or-presence-detection
https://forum.mysensors.org/topic/4281/happy-bubbles-bluetooth-presence-detector
https://forum.mysensors.org/topic/4138/nrf24l01-as-ble-beacon
You do know that there is solder pads for RFM69HW on the back of the gateway, right? And the board defs for the gateway are configured to use those pins for the RFM69 by default.
