ESP8266AVRISP: initial

libraries/ESP8266AVRISP/examples/Arduino_Wifi_AVRISP/Arduino_Wifi_AVRISP.ino

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+#include <SPI.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266mDNS.h>
+#include <ESP8266AVRISP.h>
+
+const char* host = "esp8266-avrisp";
+const char* ssid = "**********";
+const char* pass = "**********";
+const uint16_t port = 328;
+const uint8_t reset_pin = 5;
+
+ESP8266AVRISP avrprog(port, reset_pin);
+
+void setup() {
+    Serial.begin(115200);
+    Serial.println("");
+    Serial.println("Arduino AVR-ISP over TCP");
+    avrprog.setReset(false); // let the AVR run
+
+    WiFi.begin(ssid, pass);
+    while (WiFi.waitForConnectResult() != WL_CONNECTED);
+
+    MDNS.begin(host);
+    MDNS.addService("avrisp", "tcp", port);
+
+    IPAddress local_ip = WiFi.localIP();
+    Serial.print("IP address: ");
+    Serial.println(local_ip);
+    Serial.println("Use your avrdude:");
+    Serial.print("avrdude -c arduino -p <device> -P net:");
+    Serial.print(local_ip);
+    Serial.print(":");
+    Serial.print(port);
+    Serial.println(" -t # or -U ...");
+
+    // listen for avrdudes
+    avrprog.begin();
+}
+
+void loop() {
+    static AVRISPState_t last_state = AVRISP_STATE_IDLE;
+    AVRISPState_t new_state = avrprog.update();
+    if (last_state != new_state) {
+        switch (new_state) {
+            case AVRISP_STATE_IDLE: {
+                Serial.printf("[AVRISP] now idle\r\n");
+                // Use the SPI bus for other purposes
+                break;
+            }
+            case AVRISP_STATE_PENDING: {
+                Serial.printf("[AVRISP] connection pending\r\n");
+                // Clean up your other purposes and prepare for programming mode
+                break;
+            }
+            case AVRISP_STATE_ACTIVE: {
+                Serial.printf("[AVRISP] programming mode\r\n");
+                // Stand by for completion
+                break;
+            }
+        }
+        last_state = new_state;
+    }
+    // Serve the client
+    if (last_state != AVRISP_STATE_IDLE) {
+        avrprog.serve();
+    }
+}