udp: client

examples/simple-udp-client/.gitignore

@@ -0,0 +1 @@
+/build/

examples/simple-udp-client/Makefile

@@ -0,0 +1,15 @@
+BOARD ?= arduino:avr:diecimila
+PORT ?= /dev/ttyUSB0
+
+CCFLAGS += -Icfg
+
+.PHONY: build flash
+
+build:
+	arduino-cli compile -v -e --libraries coppino -b $(BOARD)
+
+flash:
+	arduino-cli -b $(BOARD) -p $(PORT) -v upload
+
+clean:
+	rm -r build

examples/simple-udp-client/simple-udp-client.ino

@@ -0,0 +1,47 @@
+#include "coppino.h"
+#include "ipv6.h"
+#include "slip.h"
+#include "udp.h"
+
+const char MY_ADDRESS[] = "\x20\x01\x04\x70\xc8\x44\x00\x31\x00\x00\x00\x00\x00\x00\xca\xfe";
+
+void setup()
+{
+  /* Customize coppino library configuration settings by editing settings.h */
+
+  /* setup serial for Internet connectivity
+   * attach a SLIP daemon on the other endpoint; a good one is `tunslip6` by Contiki
+   * $ tunslip6 -s /dev/ttyUSB0 -L -v5 -B 19200 2001:db8:1324::1/64
+   * Note: the address given is the one on the host it is running on
+   */
+  Serial.begin(19200);
+
+  /* set unique identifier of network hardware. It MUST be unique!
+   * For example, this could be your microcontroller serial number
+   * Note: pay attention to enter exactly 64 bits / 8 bytes
+   */
+  ipv6::setEUI("\xde\xad\xbe\xef\x12\x34\x56\x78");
+  /* set global address -- will be overwritten if SLAAC is enabled and a Router Advertisement is received */
+  ipv6::setGlobalAddress(MY_ADDRESS);
+}
+
+void loop()
+{
+  char message[16];
+  ipv6::IPv6Addr srcaddr = ipv6::IPv6Addr(MY_ADDRESS);
+  ipv6::IPv6Addr dstaddr = ipv6::IPv6Addr("\x20\x01\x04\x70\xc8\x44\x00\x31\x00\x00\x00\x00\x00\x00\x00\x01");
+  uint16_t srcport = 1337;
+  uint16_t dstport = 1234;
+  udp::UDPClient udpclient = udp::UDPClient(srcaddr, dstaddr, srcport, dstport);
+
+  while (true)
+  {
+    for (int i = 0; i < 32; ++i)
+    {
+      sprintf(message, "iteration #%d\r\n", i);
+
+      udpclient.send_datagram((const uint8_t *)message, strlen(message));
+      delay(1000);
+    }
+  }
+}

src/udp.cpp

@@ -87,4 +87,32 @@ namespace udp
     return -1;
   }
 
+  UDPClient::UDPClient(
+      const ipv6::IPv6Addr &_srcaddr,
+      ipv6::IPv6Addr &_dstaddr,
+      const uint16_t _srcport,
+      const uint16_t _dstport) : srcaddr(_srcaddr),
+                                 dstaddr(_dstaddr),
+                                 srcport(_srcport),
+                                 dstport(_dstport)
+  {
+    ;
+  }
+
+  void UDPClient::send_datagram(const uint8_t *obuffer, size_t len)
+  {
+    UDPPacket *outgoing_packet = (UDPPacket *)(((uint8_t *)&ipv6::packetout) + 40);
+    outgoing_packet->setSrcPort(srcport);
+    outgoing_packet->setDstPort(dstport);
+    outgoing_packet->setPayload((const char *)obuffer, len);
+    outgoing_packet->computeChecksum(&srcaddr, &dstaddr, len + 8);
+
+    ipv6::packetout.setLen(len + 8);
+    ipv6::packetout.setFlow("\x26\x12\x21");
+    ipv6::packetout.setSrcAddress(&srcaddr);
+    ipv6::packetout.setDstAddress(&dstaddr);
+    ipv6::packetout.setNextHeader(ipv6::NH_UDP);
+    ipv6::packetout.send();
+  }
+
 }

src/udp.h

@@ -4,10 +4,13 @@
 #include "Arduino.h"
 #include "ipv6.h"
 
-namespace udp {
+namespace udp
-  class UDPPacket {
+{
+  class UDPPacket
+  {
   private:
     char packet[ipv6::LEN - 40];
+
   public:
     void setSrcPort(uint16_t port);
     uint16_t getSrcPort();
@@ -18,6 +21,19 @@ namespace udp {
     void computeChecksum(const ipv6::IPv6Addr *src_addr, const ipv6::IPv6Addr *dst_addr, int len); /* computes and updates checksum in the packet */
   };
 
+  class UDPClient
+  {
+  private:
+    const ipv6::IPv6Addr &srcaddr;
+    const ipv6::IPv6Addr &dstaddr;
+    const uint16_t srcport;
+    const uint16_t dstport;
+
+  public:
+    UDPClient(const ipv6::IPv6Addr &srcaddr, ipv6::IPv6Addr &dstaddr, const uint16_t srcport, const uint16_t dstport);
+    void send_datagram(const uint8_t *payload, size_t len);
+  };
+
   /* UDP handler for lower layer protocol */
   int handleUDP(char *output_buffer, const char *input_buffer, int len);