Create stubs for first few functions

adb.go

@@ -0,0 +1,62 @@
+package adb
+
+import (
+	"context"
+	"net"
+	"sync"
+)
+
+type Serial string
+
+type Connection int
+
+const (
+	USB Connection = iota
+	Network
+)
+
+type Device struct {
+	IsConnected bool
+	SerialNo    Serial
+	ConnType    Connection
+	IP          net.IPAddr
+	FileHandle  string // TODO change this to a discrete type
+	Lock        sync.Mutex
+}
+
+type ConnOptions struct {
+	Address  net.IPAddr
+	SerialNo Serial
+}
+
+// Connect to a device by serial number or IP.
+//
+// This will return a Device struct, which can be used to call other methods.
+// If the connection fails or cannot complete on time, Connect will return an error.
+func Connect(ctx context.Context, opts ConnOptions) (Device, error) {
+	return Device{}, nil
+}
+
+// Connect to a previously discovered device.
+//
+// This function is helpful when connecting to a device found from the Devices call
+// or when reconnecting to a previously connected device.
+func (d Device) Connect(ctx context.Context) (Device, error) {
+	return d, nil
+}
+
+// Equivalent to running `adb devices`.
+//
+// This function returns a list of discovered devices, but note that they may not be connected.
+// It is recommended to call IsConnected() against the device you're interested in using and connect
+// if not already connected before proceeding.
+func Devices(ctx context.Context) ([]Device, error) {
+	return []Device{}, nil
+}
+
+// Disconnect from a device.
+//
+// If a device is already disconnected or otherwise not found, returns an error.
+func (d Device) Disconnect(ctx context.Context) error {
+	return nil
+}