Because each Feather uses a different processor, there is some light wiring that needs to be done to configure the radio pins. In particular, an interrupt-capable pin is required for IRQ but there is no one irq pin that is the same on all the Feathers!

So, while MOSI/MISO/SCK are fixed, you will want to solder three short wires for CS, RST and IRQ

Here is our tested/suggested wiring configurations and code snippets for defining the pins

ESP8266 Wiring

The ESP does not have a lot of spare pins, and the SPI pins are taken, so here's what we've tested that works:

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#define RFM95_CS  2    // "E"
#define RFM95_RST 16   // "D"
#define RFM95_INT 15   // "B"

#define RFM95_CS  2    // "E"
#define RFM95_RST 16   // "D"
#define RFM95_INT 15   // "B"

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#define RFM69_CS      2
#define RFM69_RST     16
#define RFM69_IRQ     15
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )

#define RFM69_CS      2
#define RFM69_RST     16
#define RFM69_IRQ     15
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )

This leaves the I2C default pins (4 and 5) available

Feather 32u4

The 32u4 doesn't have a lot of IRQs and the only ones available are on pins 0, 1, 2, 3 which are also the Serial RX/TX and I2C pins. So it's not great because you have to give up one of those pins.

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#define RFM95_CS  10   // "B"
#define RFM95_RST 11   // "A"
#define RFM95_INT 2    // "SDA" (only SDA/SCL/RX/TX have IRQ!)

#define RFM95_CS  10   // "B"
#define RFM95_RST 11   // "A"
#define RFM95_INT 2    // "SDA" (only SDA/SCL/RX/TX have IRQ!)

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#define RFM69_CS      10   // "B"
#define RFM69_RST     11   // "A"
#define RFM69_IRQ     2    // "SDA" (only SDA/SCL/RX/TX have IRQ!)
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )

#define RFM69_CS      10   // "B"
#define RFM69_RST     11   // "A"
#define RFM69_IRQ     2    // "SDA" (only SDA/SCL/RX/TX have IRQ!)
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )

Feather M0

The Feather M0 is really easy to use, a ton of interrupts so wiring is easy

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#define RFM95_CS  10   // "B"
#define RFM95_RST 11   // "A"
#define RFM95_INT  6   // "D"

#define RFM95_CS  10   // "B"
#define RFM95_RST 11   // "A"
#define RFM95_INT  6   // "D"

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#define RFM69_CS      10   // "B"
#define RFM69_RST     11   // "A"
#define RFM69_IRQ     6    // "D"
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )

#define RFM69_CS      10   // "B"
#define RFM69_RST     11   // "A"
#define RFM69_IRQ     6    // "D"
#define RFM69_IRQN    digitalPinToInterrupt(RFM69_IRQ )