doc: lora_lorawan: document LoRa Basics Modem

Document the current status of LoRaMAC-node and LoRa Basics Modem.

Signed-off-by: Jordan Yates <jordan@embeint.com>

Author: JordanYates

doc/connectivity/lora_lorawan/index.rst

@@ -23,12 +23,25 @@ to the internet through a gateway.
 The Zephyr implementation is based on Semtech's `LoRaMac-node library`_, which
 is included as a Zephyr module.
 
+.. note::
+
+        ``LoRaMac-node`` has been deprecated by Semtech in favor of
+        `LoRa Basics Modem`_. Porting the Zephyr API's to use
+        ``LoRa Basics Modem`` as the backend is in progress.
+
+        Currently, only the base LoRa API is supported for the SX1261, SX1262,
+        SX1272 and SX1276 chipsets through
+        :kconfig:option:`CONFIG_LORA_MODULE_BACKEND_LORA_BASICS_MODEM`.
+
+
 The LoRaWAN specification is published by the `LoRa Alliance`_.
 
 .. _`Semtech Corporation`: https://www.semtech.com/
 
 .. _`LoRaMac-node library`: https://github.com/Lora-net/LoRaMac-node
 
+.. _`LoRa Basics Modem`: https://github.com/Lora-net/SWL2001
+
 .. _`LoRa Alliance`: https://lora-alliance.org/
 
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