Use flash strings for storing debug messages in order to conserve RAM

[aentinger]

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[github-actions]

Memory usage change @ 8ea22f1

Board	flash	RAM for global variables
arduino:samd:mkr1000	🔺 +240 - +240	0 - 0
arduino:samd:mkrgsm1400	🔺 +112 - +112	0 - 0
arduino:samd:mkrnb1500	🔺 +104 - +104	0 - 0
arduino:samd:mkrwan1300	🔺 +104 - +104	0 - 0
arduino:samd:mkrwan1310	🔺 +112 - +112	0 - 0
arduino:samd:mkrwifi1010	🔺 +248 - +248	0 - 0
arduino:samd:nano_33_iot	🔺 +248 - +248	0 - 0
esp8266:esp8266:huzzah	🔺 +220 - +220	💚 -160 - -160

Click for full report table

Board	examples/ConnectionHandlerDemo flash	examples/ConnectionHandlerDemo RAM for global variables
arduino:samd:mkr1000	240	0
arduino:samd:mkrgsm1400	112	0
arduino:samd:mkrnb1500	104	0
arduino:samd:mkrwan1300	104	0
arduino:samd:mkrwan1310	112	0
arduino:samd:mkrwifi1010	248	0
arduino:samd:nano_33_iot	248	0
esp8266:esp8266:huzzah	220	-160

Click for full report CSV

Board,examples/ConnectionHandlerDemo<br>flash,examples/ConnectionHandlerDemo<br>RAM for global variables
arduino:samd:mkr1000,240,0
arduino:samd:mkrgsm1400,112,0
arduino:samd:mkrnb1500,104,0
arduino:samd:mkrwan1300,104,0
arduino:samd:mkrwan1310,112,0
arduino:samd:mkrwifi1010,248,0
arduino:samd:nano_33_iot,248,0
esp8266:esp8266:huzzah,220,-160