diff --git a/include/cmd_lora.h b/include/cmd_lora.h
index 5c6200b..b8531a4 100644
--- a/include/cmd_lora.h
+++ b/include/cmd_lora.h
@@ -7,6 +7,7 @@ extern "C" {
 
 void cmd_sf_register();
 void cmd_cr_register();
+void cmd_preamble_register();
 
 #ifdef __cplusplus
 }
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index b461349..ff7606e 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -1,4 +1,10 @@
-set(COMPONENT_SRCS "main.c console.c cmd_sf.c cmd_cr.c")
+set(COMPONENT_SRCS "\
+  main.c\
+  console.c\
+  cmd_sf.c\
+  cmd_cr.c\
+  cmd_preamble.c\
+")
 set(COMPONENT_ADD_INCLUDEDIRS ". ../include")
 
 register_component()
diff --git a/main/cmd_preamble.c b/main/cmd_preamble.c
new file mode 100644
index 0000000..e2dbd11
--- /dev/null
+++ b/main/cmd_preamble.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <string.h>
+#include "esp_log.h"
+#include "esp_console.h"
+#include "argtable3/argtable3.h"
+
+#include "cmd_lora.h"
+#include "esp32-lora.h"
+
+static struct {
+    struct arg_int *codingrate;
+    struct arg_end *end;
+    lora32_cfg_t  *lora;
+} preamble_args;
+
+int set_preamble(int argc, char **argv) {
+  int nerrors = arg_parse(argc, argv, (void **) &preamble_args);
+
+  if (nerrors != 0) {
+    arg_print_errors(stderr, preamble_args.end, argv[0]);
+
+    return 1;
+  }
+
+  //lora32_set_preamble((lora32_cfg_t*)preamble_args.lora, preamble_args.codingrate->ival[0]);
+
+
+  return 0;
+}
+
+void cmd_preamble_register(lora32_cfg_t *lora) {
+  preamble_args.codingrate = arg_int0(NULL, NULL, "<preamble>", "Preamble");
+  preamble_args.end = arg_end(1);
+  preamble_args.lora = lora;
+
+  const esp_console_cmd_t preamble_cmd = {
+    .command = "preamble",
+    .help = "Set preamble",
+    .hint = NULL,
+    .func = &set_preamble,
+    .argtable = &preamble_args
+  };
+
+  ESP_ERROR_CHECK(esp_console_cmd_register(&preamble_cmd));
+}
diff --git a/main/console.c b/main/console.c
index 962c33e..03db0ec 100644
--- a/main/console.c
+++ b/main/console.c
@@ -50,6 +50,7 @@ void console_task(void *args) {
 
   cmd_sf_register(args);
   cmd_cr_register(args);
+  cmd_preamble_register(args);
 
   const char* prompt = LOG_COLOR_I "lorcomm> " LOG_RESET_COLOR;
 
diff --git a/main/main.c b/main/main.c
index 2a94189..27e829b 100644
--- a/main/main.c
+++ b/main/main.c
@@ -185,6 +185,8 @@ void app_main(void) {
 
   xTaskCreate(console_task, "console", 4048, &lora, tskIDLE_PRIORITY + 3, NULL);
 
+  printf("%d %f\n", portTICK_PERIOD_MS, (float)(1 / portTICK_PERIOD_MS));
+
   while(1) {
     vTaskDelay(100 / portTICK_PERIOD_MS);
   }