diff --git a/.gitmodules b/.gitmodules
index 10e5d28f..062b2a8b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -6,4 +6,4 @@
 	url = https://github.com/espressif/esp-idf.git
 [submodule "deps/Arduino-CMake-Toolchain"]
 	path = deps/Arduino-CMake-Toolchain
-	url = https://github.com/a9183756-gh/Arduino-CMake-Toolchain
+	url = https://github.com/a9183756-gh/Arduino-CMake-Toolchain.git
diff --git a/include/at_client/at_logger.h b/include/at_client/at_logger.h
new file mode 100644
index 00000000..c6be04fc
--- /dev/null
+++ b/include/at_client/at_logger.h
@@ -0,0 +1,9 @@
+#ifndef ATLOGGER_H
+#define ATLOGGER_H
+
+#include <stddef.h>
+
+int atlogger_log(const char *title, const char *message);
+int atlogger_logx(const char *title, const unsigned char *bytes, size_t byteslen);
+
+#endif  // ATLOGGER_H
diff --git a/src/at_client/at_logger.c b/src/at_client/at_logger.c
new file mode 100644
index 00000000..c4994ef8
--- /dev/null
+++ b/src/at_client/at_logger.c
@@ -0,0 +1,20 @@
+#include "at_client/at_logger.h"
+#include <stdio.h>
+
+void printx(const unsigned char *bytes, size_t byteslen) {
+    for (size_t i = 0; i < byteslen; i++) {
+        printf("%02x ", bytes[i]);
+    }
+    printf("\n");
+}
+
+int atlogger_log(const char *title, const char *message) {
+    printf("%s | %s:\n", title, message);
+    return 0;
+}
+
+int atlogger_logx(const char *title, const unsigned char *bytes, size_t byteslen) {
+    printf("%s | ", title);
+    printx(bytes, byteslen);
+    return 0;
+}