Payload size


I am using a node (LoRa + Arduino) to send the temperature and humidity data to a gateway. I am using RH_RF95 Library.
driver.send (char data, sizeof(data));
My data array is “sensor1,43,22” . payload has size 20 Bytes. I wanna reduce this paload size.
Please give me an easiest solution. Thanks

Which gateway ?

I thought the RH_RF95 library was point to point LoRa only ?

This is a TTN forum, we use different libraries ?

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