initial code that compiles, no idea if this works

Feather9x_TX_RX_XXX/Feather9x_TX_RX_XXX.ino

@@ -1,9 +1,86 @@
-void setup() {
+#include <SPI.h>
-  // put your setup code here, to run once:
+#include <RH_RF95.h>
 
+/* for feather m0 */
+#define RFM95_CS 8
+#define RFM95_RST 4
+#define RFM95_INT 3
+
+// Change to 434.0 or other frequency, must match RX's freq!
+#define RF95_FREQ 915.0
+
+// Singleton instance of the radio driver
+RH_RF95 rf95(RFM95_CS, RFM95_INT);
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);     
+  pinMode(RFM95_RST, OUTPUT);
+  // Start with the LED on high
+  digitalWrite(RFM95_RST, HIGH);
+
+  // while (!Serial); // wait until serial console is open, remove if not tethered to computer
+  Serial.begin(9600);
+  delay(100);
+  Serial.println("Feather LoRa RX Test!");
+  
+  // manual reset
+  digitalWrite(RFM95_RST, LOW);
+  delay(10);
+  digitalWrite(RFM95_RST, HIGH);
+  delay(10);
+
+  while (!rf95.init()) {
+    Serial.println("LoRa radio init failed");
+    while (1);
   }
+  Serial.println("LoRa radio init OK!");
+
+  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
+  if (!rf95.setFrequency(RF95_FREQ)) {
+    Serial.println("setFrequency failed");
+    while (1);
+  }
+  Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
+
+  // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on
+
+  // The default transmitter power is 13dBm, using PA_BOOST.
+  // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then 
+  // you can set transmitter powers from 5 to 23 dBm:
+  rf95.setTxPower(23, false);
+}
+
+int16_t packetnum = 0;
 
 void loop() {
-  // put your main code here, to run repeatedly:
+  // Transmit code
+  delay(1000); // Wait 1 second between transmits, could also 'sleep' here!
+  Serial.println("Transmitting..."); // Send a message to rf95_server
   
+  char radiopacket[20] = "Hello World #      ";
+  itoa(packetnum++, radiopacket+13, 10);
+  Serial.print("Sending "); Serial.println(radiopacket);
+  radiopacket[19] = 0;
+  
+  Serial.println("Sending..."); delay(10);
+  rf95.send((uint8_t *)radiopacket, 20);
+
+  Serial.println("Waiting for packet to complete..."); delay(10);
+  rf95.waitPacketSent();
+
+  // Receiver code
+  if (rf95.available()) {
+    // Should be a message for us now   
+    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
+    uint8_t len = sizeof(buf);
+    
+    if (rf95.recv(buf, &len)) {
+      digitalWrite(LED_BUILTIN, HIGH);
+      RH_RF95::printBuffer("Received: ", buf, len);
+      Serial.print("Got: ");
+      Serial.println((char*)buf);
+      Serial.print("RSSI: ");
+      Serial.println(rf95.lastRssi(), DEC);
+    }
+  }
 }