thanks, makes sense now. i accomplish this with wifi. all my outdoor sensors are connected to a custom PCB that i designed which is in turn connected to an rpi via serial. the rpi then posts sensor readings to a local mqtt server via wifi. it's extremely reliable and works very well. for my indoor sensors they are again a custom pcb with an esp8266 and a bme280 powered with a rechargable battery (which lasts 6 months). the indoor sensor just posts to the same mqtt server. for weewx i wrote a simple driver that reads from mqtt.
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