Merge pull request #32 from hirotakaster/dev-128

update for #26

README.md

@@ -1,14 +1,15 @@
 # CoAP client, server library for Arduino.
-<a href="http://coap.technology/" target=_blank>CoAP</a> simple server, client library for Arduino IDE, ESP32.
+<a href="http://coap.technology/" target=_blank>CoAP</a> simple server, client library for Arduino IDE/PlatformIO, ESP32, ESP8266.
 
 ## Source Code
-This lightweight library's source code contains only 2 files. coap.cpp, coap.h.
+This lightweight library's source code contains only 2 files. coap-simple.cpp, coap-simple.h.
 
 ## Example
 Some sample sketches for Arduino included(/examples/).
 
  - coaptest.ino : simple request/response sample.
  - coapserver.ino : server endpoint url callback sample.
+ - esp32.ino, esp8266.ino : server endpoint url callback/response.
 
 ## How to use
 Download this source code branch zip file and extract it to the Arduino libraries directory or checkout repository. Here is checkout on MacOS X.

coap-simple.cpp

@@ -12,10 +12,23 @@ void CoapPacket::addOption(uint8_t number, uint8_t length, uint8_t *opt_payload)
     ++optionnum;
 }
 
+
 Coap::Coap(
-    UDP& udp
+    UDP& udp,
+    int coap_buf_size  /* default value is COAP_BUF_MAX_SIZE */
 ) {
     this->_udp = &udp;
+    this->coap_buf_size = coap_buf_size;
+    this->tx_buffer = new uint8_t[this->coap_buf_size];
+    this->rx_buffer = new uint8_t[this->coap_buf_size];
+}
+
+Coap::~Coap() {
+    if (this->tx_buffer != NULL)
+      delete[] this->tx_buffer;
+
+    if (this->rx_buffer != NULL)
+      delete[] this->rx_buffer;
 }
 
 bool Coap::start() {
@@ -33,8 +46,7 @@ uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip) {
 }
 
 uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip, int port) {
-    uint8_t buffer[COAP_BUF_MAX_SIZE];
-    uint8_t *p = buffer;
+    uint8_t *p = this->tx_buffer;
     uint16_t running_delta = 0;
     uint16_t packetSize = 0;
 
@@ -45,7 +57,7 @@ uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip, int port) {
     *p++ = packet.code;
     *p++ = (packet.messageid >> 8);
     *p++ = (packet.messageid & 0xFF);
-    p = buffer + COAP_HEADER_SIZE;
+    p = this->tx_buffer + COAP_HEADER_SIZE;
     packetSize += 4;
 
     // make token
@@ -60,7 +72,7 @@ uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip, int port) {
         uint32_t optdelta;
         uint8_t len, delta;
 
-        if (packetSize + 5 + packet.options[i].length >= COAP_BUF_MAX_SIZE) {
+        if (packetSize + 5 + packet.options[i].length >= coap_buf_size) {
             return 0;
         }
         optdelta = packet.options[i].number - running_delta;
@@ -92,7 +104,7 @@ uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip, int port) {
 
     // make payload
     if (packet.payloadlen > 0) {
-        if ((packetSize + 1 + packet.payloadlen) >= COAP_BUF_MAX_SIZE) {
+        if ((packetSize + 1 + packet.payloadlen) >= coap_buf_size) {
             return 0;
         }
         *p++ = 0xFF;
@@ -101,7 +113,7 @@ uint16_t Coap::sendPacket(CoapPacket &packet, IPAddress ip, int port) {
     }
 
     _udp->beginPacket(ip, port);
-    _udp->write(buffer, packetSize);
+    _udp->write(this->tx_buffer, packetSize);
     _udp->endPacket();
 
     return packet.messageid;
@@ -217,29 +229,27 @@ int Coap::parseOption(CoapOption *option, uint16_t *running_delta, uint8_t **buf
 }
 
 bool Coap::loop() {
-
-    uint8_t buffer[COAP_BUF_MAX_SIZE];
     int32_t packetlen = _udp->parsePacket();
 
     while (packetlen > 0) {
-        packetlen = _udp->read(buffer, packetlen >= COAP_BUF_MAX_SIZE ? COAP_BUF_MAX_SIZE : packetlen);
+        packetlen = _udp->read(this->rx_buffer, packetlen >= coap_buf_size ? coap_buf_size : packetlen);
 
         CoapPacket packet;
 
         // parse coap packet header
-        if (packetlen < COAP_HEADER_SIZE || (((buffer[0] & 0xC0) >> 6) != 1)) {
+        if (packetlen < COAP_HEADER_SIZE || (((this->rx_buffer[0] & 0xC0) >> 6) != 1)) {
             packetlen = _udp->parsePacket();
             continue;
         }
 
-        packet.type = (buffer[0] & 0x30) >> 4;
-        packet.tokenlen = buffer[0] & 0x0F;
-        packet.code = buffer[1];
-        packet.messageid = 0xFF00 & (buffer[2] << 8);
-        packet.messageid |= 0x00FF & buffer[3];
+        packet.type = (this->rx_buffer[0] & 0x30) >> 4;
+        packet.tokenlen = this->rx_buffer[0] & 0x0F;
+        packet.code = this->rx_buffer[1];
+        packet.messageid = 0xFF00 & (this->rx_buffer[2] << 8);
+        packet.messageid |= 0x00FF & this->rx_buffer[3];
 
         if (packet.tokenlen == 0)  packet.token = NULL;
-        else if (packet.tokenlen <= 8)  packet.token = buffer + 4;
+        else if (packet.tokenlen <= 8)  packet.token = this->rx_buffer + 4;
         else {
             packetlen = _udp->parsePacket();
             continue;
@@ -249,8 +259,8 @@ bool Coap::loop() {
         if (COAP_HEADER_SIZE + packet.tokenlen < packetlen) {
             int optionIndex = 0;
             uint16_t delta = 0;
-            uint8_t *end = buffer + packetlen;
-            uint8_t *p = buffer + COAP_HEADER_SIZE + packet.tokenlen;
+            uint8_t *end = this->rx_buffer + packetlen;
+            uint8_t *p = this->rx_buffer + COAP_HEADER_SIZE + packet.tokenlen;
             while(optionIndex < COAP_MAX_OPTION_NUM && *p != 0xFF && p < end) {
                 //packet.options[optionIndex];
                 if (0 != parseOption(&packet.options[optionIndex], &delta, &p, end-p))

coap-simple.h

@@ -177,15 +177,20 @@ class Coap {
         CoapUri uri;
         CoapCallback resp;
         int _port;
+        int coap_buf_size;
+        uint8_t *tx_buffer = NULL;
+        uint8_t *rx_buffer = NULL;
 
         uint16_t sendPacket(CoapPacket &packet, IPAddress ip);
         uint16_t sendPacket(CoapPacket &packet, IPAddress ip, int port);
         int parseOption(CoapOption *option, uint16_t *running_delta, uint8_t **buf, size_t buflen);
 
     public:
         Coap(
-            UDP& udp
+            UDP& udp,
+            int coap_buf_size = COAP_BUF_MAX_SIZE
         );
+        ~Coap();
         bool start();
         bool start(int port);
         void response(CoapCallback c) { resp = c; }

examples/esp32/esp32.ino

@@ -12,6 +12,10 @@ void callback_response(CoapPacket &packet, IPAddress ip, int port);
 void callback_light(CoapPacket &packet, IPAddress ip, int port);
 
 // UDP and CoAP class
+// other initialize is "Coap coap(Udp, 512);"
+// 2nd default parameter is COAP_BUF_MAX_SIZE(defaulit:128)
+// For UDP fragmentation, it is good to set the maximum under
+// 1280byte when using the internet connection.
 WiFiUDP udp;
 Coap coap(udp);
 

examples/esp8266/esp8266.ino

@@ -12,6 +12,10 @@ void callback_response(CoapPacket &packet, IPAddress ip, int port);
 void callback_light(CoapPacket &packet, IPAddress ip, int port);
 
 // UDP and CoAP class
+// other initialize is "Coap coap(Udp, 512);"
+// 2nd default parameter is COAP_BUF_MAX_SIZE(defaulit:128)
+// For UDP fragmentation, it is good to set the maximum under
+// 1280byte when using the internet connection.
 WiFiUDP udp;
 Coap coap(udp);
 

library.json

@@ -1,6 +1,6 @@
 {
     "name" : "CoAP simple library",
-    "version" : "1.3.24",
+    "version" : "1.3.25",
     "description" : "Simple CoAP client/server library for generic Arduino Client hardware.",
     "keywords" : "communication, coap, wifi",
     "authors" : {

library.properties

@@ -1,5 +1,5 @@
 name=CoAP simple library
-version=1.3.24
+version=1.3.25
 author=Hirotaka Niisato <hirotakaster@gmail.com>
 maintainer=Hirotaka Niisato <hirotakaster@gmail.com>
 sentence=Simple CoAP client/server library for generic Arduino Client hardware.

license.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2018 Hirotaka Niisato
+Copyright (c) 2022 Hirotaka Niisato
 This software is released under the MIT License.
 
 Permission is hereby granted, free of charge, to any person obtaining