Added ECHO cmd and fixed some timing issues

main/CMakeLists.txt

@@ -22,6 +22,7 @@ idf_component_register(
   "cmd/cmd_tap_notify.c"
   "cmd/cmd_cache_status.c"
   "cmd/cmd_espnow_unicast_test.c"
+  "cmd/cmd_espnow_echo_ping.c"
   "cmd/cmd_espnow_find_me.c"
   "cmd/cmd_restart.c"
   "pod_reboot.c"
@@ -61,6 +62,7 @@ idf_component_register(
   esp_driver_i2c
   esp_adc
   app_update
+  esp_timer
   bma456)
 
 target_compile_definitions(${COMPONENT_LIB}