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RFM98 (433mhz)
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Cheap LORA modules.
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wireless mqtt over gprs… can it be done with arduino + display + this modem ? 
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That display looks pretty great! Anyone know of a spec sheet and/or interface doc for it?
you can use it on arduino and esp8266 / nodeMCU.
I’m gonna use it on the single channel gateway
ssd1306:
- http://nodemcu.readthedocs.io/en/master/en/modules/u8g/
- https://github.com/squix78/esp8266-oled-ssd1306/tree/master/examples
- https://learn.adafruit.com/monochrome-oled-breakouts/wiring-128x32-i2c-display
this BIG 2.42 OLED 128x64 has the same chip inside (have one) so
you don’t need glasses 
the BIG on is really big in size and prize
I use this smaller one, with the Adafruit library (#include <Adafruit_ssd1306syp.h>) and the MenuSysten (#include <MenuSystem.h>) and they work pretty well with different font sizes.
be careful when you replace one (after 2 years the are burned in): sometimes Vcc & Gnd are changed
who knows where to get “decompression valves” for watertight boxes
with pressure equalization valve or something similar I always get big or one way ones
THANKS, also available in switzerland
Got some, but didn’t found where to buy the according nut 