diff --git a/protocol/main.c b/protocol/main.c
new file mode 100644
index 0000000..6b193c3
--- /dev/null
+++ b/protocol/main.c
@@ -0,0 +1,37 @@
+#include "protocol.h"
+#include "stdio.h"
+
+int main(){
+    printf("Test number\n");
+    char number = 112;
+    uint8_t buffer_number[] = {};
+    size_t len_buffer_number;
+    protocol_encode_number(number, buffer_number, &len_buffer_number);
+    for (int i = 0; i < len_buffer_number; i++){
+        printf("buffer %d: %d\n", i, buffer_number[i]);
+    }
+
+    printf("---------------------------------------\n");
+
+    char encode_message_number[] = {};
+    size_t len_message_number;
+    protocol_decode(buffer_number, len_buffer_number, encode_message_number, &len_message_number);
+    printf("number: %d\n", encode_message_number[0]);
+
+    printf("\nTest word\n");
+    char* word = "word";
+    uint8_t buffer[] = {};
+    size_t len_buffer;
+    protocol_encode_word(word, strlen(word), buffer, &len_buffer);
+    for (int i = 0; i < len_buffer; i++){
+        printf("buffer %d: %d\n", i, buffer[i]);
+    }
+
+    printf("---------------------------------------\n");
+
+    char encode_message[] = {};
+    size_t len_message;
+    protocol_decode(buffer, len_buffer, encode_message, &len_message);
+    printf("message: %s\n", encode_message);
+    return 0;
+}
\ No newline at end of file
diff --git a/protocol/protocol.c b/protocol/protocol.c
new file mode 100644
index 0000000..c6dead7
--- /dev/null
+++ b/protocol/protocol.c
@@ -0,0 +1,39 @@
+#include "protocol.h"
+
+void protocol_decode(uint8_t encode_message[], size_t len_encode_message, char decode_message[], size_t* len_decode_message){
+    int count = 0;
+    for(int i = 0; i < len_encode_message; i++){
+        switch (encode_message[i]) {
+            case FLAG_NUMBER:
+                i++;
+                decode_message[count++] = encode_message[i]; // max 127
+                i++;
+                break;
+            case FLAG_WORD:
+                i++;
+                for (int z = 0; z < encode_message[i]; z++){
+                    i++;
+                    decode_message[count++] = encode_message[i];
+                }
+                break;
+        }
+    }
+    *len_decode_message = count;
+}
+
+void protocol_encode_number(char number, uint8_t encode_message[], size_t* len_encode_message){
+    int count = 0;
+    encode_message[count++] = FLAG_NUMBER;
+    encode_message[count++] = number;
+    *len_encode_message = count;
+}
+
+void protocol_encode_word(char decode_word[], size_t len_encode_word, uint8_t encode_message[], size_t* len_encode_message){
+    int count = 0;
+    encode_message[count++] = FLAG_WORD;
+    encode_message[count++] = len_encode_word;
+    for (int i = 0; i < len_encode_word; i++){
+        encode_message[count++] = decode_word[i];
+    }
+    *len_encode_message = count;
+}
\ No newline at end of file
diff --git a/protocol/protocol.h b/protocol/protocol.h
new file mode 100644
index 0000000..53819c4
--- /dev/null
+++ b/protocol/protocol.h
@@ -0,0 +1,14 @@
+#ifndef PROTOCOL_H
+#define PROTOCOL_H
+
+#include <stdint.h>
+#include <string.h>
+
+#define FLAG_NUMBER 0
+#define FLAG_WORD 1
+
+void protocol_decode(uint8_t encode_message[], size_t len_encode_message, char decode_message[], size_t* len_decode_message);
+void protocol_encode_number(char number, uint8_t encode_message[], size_t* len_encode_message);
+void protocol_encode_word(char decode_word[], size_t len_encode_word, uint8_t encode_message[], size_t* len_encode_message);
+
+#endif //PROTOCOL_H