Proof of concept to handle lights

lw12.c

@@ -0,0 +1,66 @@
+/*
+ * lw12.c
+ * Copyright (C) 2017 jpk <jpk@dwarf>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+//#include <netdb.h>
+
+#include "lw12.h"
+
+
+int lw12_connect(int *sockfd, struct sockaddr_in *addr, uint16_t port,
+        char *hostname) {
+    if ((*sockfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1) {
+        perror("socket");
+        exit(EXIT_FAILURE);
+    }
+
+    memset((char *)addr, 0, sizeof(struct sockaddr_in));
+    addr->sin_family = AF_INET;
+    addr->sin_port = htons(port);
+    inet_aton(hostname, &addr->sin_addr);
+
+    return *sockfd;
+}
+
+int lw12_sendcmd(int sockfd, struct sockaddr_in *addr, char *cmd) {
+    const socklen_t slen = sizeof(struct sockaddr_in);
+
+    if (sendto(sockfd, cmd, LW12_CMD_LENGTH, 0, (const struct sockaddr *)addr,
+                slen) == -1) {
+        perror("sendto");
+        close(sockfd);
+        exit(EXIT_FAILURE);
+    }
+
+    return 0;
+}
+
+int main() {
+    int sockfd = 0;
+    struct sockaddr_in server_addr;
+
+    char serverip[] = "192.168.178.24";
+    uint16_t serverport = 5000;
+
+    lw12_connect(&sockfd, &server_addr, serverport, serverip);
+    lw12_sendcmd(sockfd, &server_addr, (char *)LIGHTS_ON);
+
+    usleep(2000000);
+
+    lw12_sendcmd(sockfd, &server_addr, (char *)LIGHTS_OFF);
+
+    close(sockfd);
+
+    return 0;
+}

lw12.h

@@ -0,0 +1,19 @@
+/*
+ * lw12.h
+ * Copyright (C) 2017 jpk <jpk@dwarf>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#ifndef LW12_H
+#define LW12_H
+
+#define LW12_CMD_LENGTH 9
+
+#define LIGHTS_ON   "\x7e\x04\x04\x01\xff\xff\xff\x00\xef"
+#define LIGHTS_OFF  "\x7e\x04\x04\x00\x00\x0f\xff\x00\xef"
+
+// set lights "7e070503{red:02x}{green:02x}{blue:02x}00ef"
+#define LIGHT_COLOR "\x7\xe\x07\x05\x03\x00\x00\x00\x00\xef"
+
+#endif /* !LW12_H */