@ArduiSens that's true, many optimizations can be done to save additional storage. With v1.5.1 a design issue eating up 20% of the storage has been fixed but many things for sure can be improved. As for the current version, try lowering down MAX_SENSORS (which by default allocates the pointers for 10 child IDs) and set DEBUG to 0 after your tests. The latter especially should give you another 20% of storage back (static strings of the debug output are consuming most of this storage). Thanks
@ArduiSens thanks, good catch, this looks like a mistake on my side, keep on eye on https://github.com/mysensors/NodeManager/issues/206 for a fix which should come shortly.
Hi, the workaround of using a static variable is ok but of course would not necessarily work well in any situation but I'm glad you got it working somehow 
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However you're right, this is a known issue in NodeManager. https://github.com/mysensors/NodeManager/issues/176 should tell you why and answer your question #2. The solution unfortunately is not that easy since would require re-thinking the way sensors are mapped to child IDs. Work is in progress though (https://github.com/mysensors/NodeManager/issues/198)
@ArduiSens RS485 should be already there in the development version (https://github.com/mysensors/NodeManager/tree/development). Nothing special, I've just added to config.h some sample directives, commented out by default. Let me know in case this approach can be improved. Thanks!
@MCF I've added https://github.com/mysensors/NodeManager/issues/203 to track this request. Feel free to add any relevant comment or code samples to the issue. Thanks!
@betonmoewe thanks, but according to https://www.mysensors.org/download/serial_api_20, V_LIGHT_LEVEL is for uncalibrated light level (0-100%) V_LEVEL for light level in lux. Anyway, glad you made it working for your setup.
As for the duplicated child ID issue, this shouldn't happen (https://github.com/mysensors/NodeManager/blob/development/NodeManager.cpp#L3277). I wonder if you have reached the maximum number of child IDs, try increasing MAX_SENSORS (e.g. #define MAX_SENSORS 15) in your config.h. Thanks
@betonmoewe mmm this is weird, as far as there is a:
SEND D=0 I=1 C=1 T=37 S= I=2521 F=0.00
should imply send() has been called successfully. Any chance to check debug output in the gateway to ensure messages are actually delivered? Thanks
@betonmoewe the way I read it is a message of type 37 (V_LEVEL) whose value is 2521 has been sent to the controller. S, I and F correspond to string, integer and float and depending on the sensor a value is set to only one of those. So your reported light level is 2521. The BME sensor reports float values so 24.76 is under F. Does it make sense? Thanks
@jaylove thanks, CHANGE has been made the default option indeed in v1.6-dev. Btw in case you can give it a try, it would be great (https://github.com/mysensors/NodeManager/tree/development) Thanks!
@betonmoewe thanks for reporting this issue. The A2 used is irrelevant since for i2c sensors, the pin provided is not used at all but has to be a valid pin. I may be wrong but I see a "19" reported. Is the issue about the wrong value or something different? Thanks