[LoRaWAN] Add simple receive methods

src/protocols/LoRaWAN/LoRaWAN.cpp

@@ -1317,6 +1317,20 @@ int16_t LoRaWANNode::downlink(String& str, LoRaWANEvent_t* event) {
 }
 #endif
 
+int16_t LoRaWANNode::downlink(LoRaWANEvent_t* event) {
+  int16_t state = RADIOLIB_ERR_NONE;
+
+  // build a temporary buffer
+  // LoRaWAN downlinks can have 250 bytes at most with 1 extra byte for NULL
+  size_t length = 0;
+  uint8_t data[251];
+
+  // wait for downlink
+  state = this->downlink(data, &length, event);
+
+  return(state);
+}
+
 int16_t LoRaWANNode::downlink(uint8_t* data, size_t* len, LoRaWANEvent_t* event) {
   // handle Rx1 and Rx2 windows - returns RADIOLIB_ERR_NONE if a downlink is received
   int16_t state = downlinkCommon();
@@ -1650,6 +1664,16 @@ int16_t LoRaWANNode::sendReceive(String& strUp, uint8_t port, String& strDown, b
 }
 #endif
 
+int16_t LoRaWANNode::sendReceive(uint8_t* dataUp, size_t lenUp, uint8_t port, bool isConfirmed, LoRaWANEvent_t* eventUp, LoRaWANEvent_t* eventDown) {
+  // send the uplink
+  int16_t state = this->uplink(dataUp, lenUp, port, isConfirmed, eventUp);
+  RADIOLIB_ASSERT(state);
+
+  // wait for the downlink
+  state = this->downlink(eventDown);
+  return(state);
+}
+
 int16_t LoRaWANNode::sendReceive(const char* strUp, uint8_t port, uint8_t* dataDown, size_t* lenDown, bool isConfirmed, LoRaWANEvent_t* eventUp, LoRaWANEvent_t* eventDown) {
   // send the uplink
   int16_t state = this->uplink(strUp, port, isConfirmed, eventUp);

src/protocols/LoRaWAN/LoRaWAN.h

@@ -533,6 +533,14 @@ class LoRaWANNode {
     */
     int16_t downlink(uint8_t* data, size_t* len, LoRaWANEvent_t* event = NULL);
 
+    /*!
+      \brief Wait for downlink, simplified to allow for simpler sendReceive
+      \param event Pointer to a structure to store extra information about the event
+      (port, frame counter, etc.). If set to NULL, no extra information will be passed to the user.
+      \returns \ref status_codes
+    */
+    int16_t downlink(LoRaWANEvent_t* event = NULL);
+
     #if defined(RADIOLIB_BUILD_ARDUINO)
     /*!
       \brief Send a message to the server and wait for a downlink during Rx1 and/or Rx2 window.
@@ -580,6 +588,20 @@ class LoRaWANNode {
     */
     int16_t sendReceive(uint8_t* dataUp, size_t lenUp, uint8_t port, uint8_t* dataDown, size_t* lenDown, bool isConfirmed = false, LoRaWANEvent_t* eventUp = NULL, LoRaWANEvent_t* eventDown = NULL);
 
+    /*!
+      \brief Send a message to the server and wait for a downlink but don't bother the user with downlink contents
+      \param dataUp Data to send.
+      \param lenUp Length of the data.
+      \param port Port number to send the message to.
+      \param isConfirmed Whether to send a confirmed uplink or not.
+      \param eventUp Pointer to a structure to store extra information about the uplink event
+      (port, frame counter, etc.). If set to NULL, no extra information will be passed to the user.
+      \param eventDown Pointer to a structure to store extra information about the downlink event
+      (port, frame counter, etc.). If set to NULL, no extra information will be passed to the user.
+      \returns \ref status_codes
+    */
+    int16_t sendReceive(uint8_t* dataUp, size_t lenUp, uint8_t port = 1, bool isConfirmed = false, LoRaWANEvent_t* eventUp = NULL, LoRaWANEvent_t* eventDown = NULL);
+
     /*!
       \brief Set device status.
       \param battLevel Battery level to set. 0 for external power source, 1 for lowest battery,