made progress in arduino example

arduino-example/src/utils.cpp

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+/**
+ *
+ * Copyright (c) 2020-2025 IRext Opensource Organization
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <Arduino.h>
+
+#include <string.h>
+
+
+// public function definitions
+int splitString(const char *str, char *parts[],
+                const int parts_max, const char *delimiter) {
+    char *pch = nullptr;
+    char *copy = nullptr;
+    char *tmp = nullptr;
+    int i = 0;
+
+    copy = strdup(str);
+    if (nullptr == copy) {
+        goto _exit;
+    }
+
+    pch = strtok(copy, delimiter);
+
+    tmp = strdup(pch);
+    if (nullptr == tmp) {
+        goto _exit;
+    }
+
+    if (i >= parts_max) {
+        goto _exit;
+    }
+    parts[i++] = tmp;
+
+    while (pch) {
+        pch = strtok(nullptr, delimiter);
+        if (nullptr == pch)
+            break;
+
+        tmp = strdup(pch);
+        if (nullptr == tmp) {
+            goto _exit;
+        }
+
+        if (i >= parts_max) {
+            goto _exit;
+        }
+        parts[i++] = tmp;
+    }
+
+    free(copy);
+    return i;
+
+    _exit:
+        free(copy);
+    for (int j = 0; j < i; j++) {
+        free(parts[j]);
+    }
+    return -1;
+}