Suggest gateway

Hi everyone, I am learning about IoT, this topic is to get recommendations about any LoRa concentrator, I don´t need a lorawan server because my nodes (actually 15, but it will increase) send data every 10 seconds, so they can saturate the lorawan, I need LoRa multichannel concentrator to get this data, preferenctly a concentrator with serial communication. Any suggest?

Off topic for this TTI funded forum for TTN LoRaWAN.

You may also be exceeding legal duty cycle limits so you may want to find a solicitor as well as a card.