7 files changed, 191 insertions, 0 deletions

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..b32bad6
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,45 @@
+---
+AccessModifierOffset: -4
+AlignConsecutiveAssignments: 'true'
+AlignConsecutiveDeclarations: 'true'
+AlignEscapedNewlines: Left
+AlignTrailingComments: 'true'
+AlwaysBreakAfterReturnType: TopLevelDefinitions
+BreakBeforeBraces: Stroustrup
+BreakConstructorInitializers: BeforeComma
+BreakInheritanceList: BeforeComma
+ColumnLimit: '0'
+CompactNamespaces: 'false'
+Cpp11BracedListStyle: 'false'
+FixNamespaceComments: 'true'
+IncludeBlocks: Regroup
+IncludeCategories:
+    - Regex: '^.*(precomp|pch|stdafx)'
+      Priority: -1
+    - Regex: '^<.*>'
+      Priority: 1
+    - Regex: '^".*"'
+      Priority: 2
+    - Regex: '.*'
+      Priority: 3
+IndentCaseLabels: 'false'
+IndentPPDirectives: AfterHash
+IndentWidth: '4'
+IndentWrappedFunctionNames: 'false'
+KeepEmptyLinesAtTheStartOfBlocks: 'false'
+PointerAlignment: Right
+SortIncludes: 'true'
+SpaceAfterCStyleCast: 'true'
+SpaceAfterTemplateKeyword: 'false'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: 'false'
+SpaceInEmptyParentheses: 'false'
+SpacesInAngles: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInConditionalStatement: 'true'
+SpacesInParentheses: 'false'
+Standard: Auto
+TabWidth: '4'
+UseTab: ForIndentation
+...
diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..0bceb5b
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,19 @@
+---
+Checks: "*,
+        -abseil-*,
+        -altera-*,
+        -android-*,
+        -fuchsia-*,
+        -google-*,
+        -llvm*,
+        -modernize-use-trailing-return-type,
+        -zircon-*,
+        -readability-else-after-return,
+        -readability-static-accessed-through-instance,
+        -readability-avoid-const-params-in-decls,
+        -cppcoreguidelines-non-private-member-variables-in-classes,
+        -misc-non-private-member-variables-in-classes,
+"
+WarningsAsErrors: ''
+HeaderFilterRegex: ''
+FormatStyle: none
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cd42ee3
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+bin/
+obj/
diff --git a/compile_flags.txt b/compile_flags.txt
new file mode 100644
index 0000000..8e3330c
--- /dev/null
+++ b/compile_flags.txt
@@ -0,0 +1,8 @@
+-Wall
+-Werror
+-Wextra
+-Wconversion
+-Wdouble-promotion
+-pedantic
+-std=c17
+-Iinclude
diff --git a/config.mk b/config.mk
new file mode 100644
index 0000000..8ca0709
--- /dev/null
+++ b/config.mk
@@ -0,0 +1,2 @@
+CFLAGS=-Wall -Werror -Wextra -Wconversion -Wdouble-promotion -pedantic -std=c17 -Iinclude
+LDFLAGS=-lmosquitto
diff --git a/makefile b/makefile
new file mode 100644
index 0000000..7fada65
--- /dev/null
+++ b/makefile
@@ -0,0 +1,26 @@
+include config.mk
+
+BINARY=bin/client
+
+SRC_FILES=$(wildcard src/*.c)
+OBJ_FILES=$(patsubst src/%.c,obj/%.o,$(SRC_FILES))
+
+release: $(BINARY)
+release: CFLAGS+=-DNDEBUG -O2
+
+debug: $(BINARY)
+debug: CFLAGS+=-g
+
+$(BINARY): $(OBJ_FILES) | bin
+        cc $(LDFLAGS) $^ -o $@
+
+obj/%.o: src/%.c | obj
+        cc $(CFLAGS) -c $< -o $@
+
+bin obj:
+        mkdir -p $@
+
+clean:
+        rm -rf bin obj
+
+.PHONY: release debug clean
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..9579568
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,89 @@
+// Standard C
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// System
+#include <unistd.h>
+
+// Project
+#include <mosquitto.h>
+
+#define CLIENT_ID "my-client-id"
+#define HOST "192.168.77.2"
+#define PORT 1883
+#define USERNAME "zigbee2mqtt"
+#define PASSWORD "xoorei2uk2booSudies4Numoek1uot"
+#define TOPIC "zigbee2mqtt/Kontaktsensor"
+#define KEEPALIVE 10
+#define WAIT_UNTIL_RECONNECT 10
+
+static volatile bool terminate = false; // NOLINT
+
+void
+handler(int signal)
+{
+        if ( signal == SIGINT ) {
+                terminate = true;
+        }
+}
+
+static void
+message_callback(struct mosquitto *mosq, void *obj, const struct mosquitto_message *message)
+{
+        (void) obj;
+        (void) mosq;
+        printf("message '%.*s' for topic '%s'\n",
+               message->payloadlen, (const char *) message->payload,
+               message->topic);
+}
+
+int
+main(void)
+{
+        (void) signal(SIGINT, handler);
+
+        mosquitto_lib_init();
+
+        struct mosquitto *client = mosquitto_new(CLIENT_ID, true, NULL);
+        if ( client == NULL ) {
+                (void) fprintf(stderr, "error on new client...\n");
+                return EXIT_FAILURE;
+        }
+
+        int err = mosquitto_username_pw_set(client, USERNAME, PASSWORD);
+        if ( err != MOSQ_ERR_SUCCESS ) {
+                (void) fprintf(stderr, "error: %s\n", mosquitto_strerror(err));
+                mosquitto_destroy(client);
+                return EXIT_FAILURE;
+        }
+
+        mosquitto_message_callback_set(client, message_callback);
+
+        err = mosquitto_connect(client, HOST, PORT, KEEPALIVE);
+        if ( err != MOSQ_ERR_SUCCESS ) {
+                (void) fprintf(stderr, "error: %s\n", mosquitto_strerror(err));
+                mosquitto_destroy(client);
+                return EXIT_FAILURE;
+        }
+
+        mosquitto_subscribe(client, NULL, TOPIC, 0);
+
+        while ( !terminate ) {
+                err = mosquitto_loop(client, -1, 1);
+                if ( !terminate && err ) {
+                        (void) fprintf(stderr, "connection error: %s\n", mosquitto_strerror(err));
+                        sleep(WAIT_UNTIL_RECONNECT); // NOLINT
+                        mosquitto_reconnect(client);
+                }
+        }
+
+        printf("cleanup...\n");
+        mosquitto_disconnect(client);
+        mosquitto_destroy(client);
+
+        mosquitto_lib_cleanup();
+
+        return EXIT_SUCCESS;
+}