sds

commit c81c3db79e57f4037436af90da68564807ab50d6
parent ff5c4205827063dd6b774d34bb2809aa68bfdbd0
Author: Markus Hanetzok <markus@hanetzok.net>
Date:   Tue, 18 Nov 2025 22:37:16 +0100

add testserver

Diffstat:
M
.gitignore
 | 
1
+
M
Makefile
 | 
5
+++--
M
sensors.def.h
 | 
12
++++++------
A
testserver.c
 | 
42
++++++++++++++++++++++++++++++++++++++++++

4 files changed, 52 insertions(+), 8 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,3 @@
 sds
+testserver
 sensors.h
diff --git a/Makefile b/Makefile
@@ -1,8 +1,9 @@
 default: build
 
-build: clean
+build:
 	@if [ ! -f sensors.h ]; then cp sensors.def.h sensors.h; fi
 	gcc -Wall -o sds sds.c -l curl
+	gcc -Wall -o testserver testserver.c
 
 install: build
 	cp -f sds /usr/bin/sds
@@ -12,4 +13,4 @@ uninstall:
 	rm -f /usr/bin/sds
 
 clean:
-	rm -rf sds
+	rm -rf sds testserver
diff --git a/sensors.def.h b/sensors.def.h
@@ -6,18 +6,18 @@
    Foundation, either version 3 of the License, or (at your option) any later
    version.
 
-   sds is distributed in the hope that it will be useful, but WITHOUT ANY 
-   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 
+   sds is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
    A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
-   You should have received a copy of the GNU General Public License along with 
-   sds. If not, see <https://www.gnu.org/licenses/>. 
+   You should have received a copy of the GNU General Public License along with
+   sds. If not, see <https://www.gnu.org/licenses/>.
 */
 
 #include <stdio.h>
 
 static const Sensor sensors[] = {
     // name                       // address             // unit
-  { "Sensor description",         "192.168.178.1/temp", "C"},
-  { "Another sensor description", "192.168.178.1/hum",  "%"},
+  { "Testserver",                 "localhost:8080", "C"},
 };
+
diff --git a/testserver.c b/testserver.c
@@ -0,0 +1,42 @@
+/* very simple webserver to mock a sensor for testing */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+int main() {
+    int server_fd, client_fd;
+    struct sockaddr_in address;
+    int opt = 1;
+    int addrlen = sizeof(address);
+    char response[] =
+        "HTTP/1.1 200 OK\r\n"
+        "Content-Type: text/plain\r\n"
+        "Content-Length: 4\r\n"
+        "\r\n"
+        "3.14";
+
+    server_fd = socket(AF_INET, SOCK_STREAM, 0);
+
+    setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+    address.sin_family = AF_INET;
+    address.sin_addr.s_addr = INADDR_ANY;
+    address.sin_port = htons(8080);
+
+    bind(server_fd, (struct sockaddr *)&address, sizeof(address));
+
+    listen(server_fd, 3);
+
+    printf("Server running on port 8080...\n");
+
+    while (1) {
+        client_fd = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
+        write(client_fd, response, strlen(response));
+        close(client_fd);
+    }
+
+    return 0;
+}
+