include/relay_chn.h

@@ -49,6 +49,7 @@ typedef enum relay_chn_direction_enum relay_chn_direction_t;
  * @brief Enums that represent the state of a relay channel.
  */
 enum relay_chn_state_enum {
+    RELAY_CHN_STATE_UNDEFINED,  ///< The relay channel state is undefined.
     RELAY_CHN_STATE_FREE,       ///< The relay channel is free to run or execute commands.
     RELAY_CHN_STATE_STOPPED,    ///< The relay channel is stopped and not running.
     RELAY_CHN_STATE_FORWARD,    ///< The relay channel is running in the forward direction.

src/relay_chn.c

@@ -648,16 +648,16 @@ static void relay_chn_issue_cmd(relay_chn_t* relay_chn, relay_chn_cmd_t cmd)
 /* relay_chn APIs */
 relay_chn_state_t relay_chn_get_state(uint8_t chn_id)
 {
-    if (!relay_chn_is_channel_id_valid(chn_id)) {
-        return RELAY_CHN_STATE_STOPPED;
+    if (!relay_chn_is_channel_id_valid(chn_id) || chn_id == RELAY_CHN_ID_ALL) {
+        return RELAY_CHN_STATE_UNDEFINED;
     }
     return relay_channels[chn_id].state;
 }
 
 char *relay_chn_get_state_str(uint8_t chn_id)
 {
-    if (!relay_chn_is_channel_id_valid(chn_id)) {
-        return "INVALID";
+    if (!relay_chn_is_channel_id_valid(chn_id) || chn_id == RELAY_CHN_ID_ALL) {
+        return relay_chn_state_str(RELAY_CHN_STATE_UNDEFINED);
     }
     return relay_chn_state_str(relay_channels[chn_id].state);
 }