Stop setting channel_override_set() in RPC calls to change the Timespec; Detect if timespec is empty and skip driving the channel in this case

src/channel.c

@@ -4,7 +4,7 @@
 #include "frozen/frozen.h"
 
 static void channel_timespec_cb(void *arg);
-static bool channel_timespec(int idx);
+static void channel_timespec(int idx);
 
 static struct channel_t s_channels[CHANNEL_MAX];
 static int s_num_channels = 0;
@@ -245,6 +245,7 @@ bool channel_get(int idx) {
 // This method is called every second. It looks at the timespec for the channel
 // and compares it with the channel_override flag, to see if the channel should
 // be switched. Logic:
+// - if timespec is missing or empty, return.
 // - if channel_override is false: follow timespec and set channel accordingly.
 // - if channel_override ie true:
 //   - if timespec wants the channel set differently, leave it as-is
@@ -252,18 +253,21 @@ bool channel_get(int idx) {
 // This behavior lets users set the channel (RPC or Button), and timespec will
 // pick it up and govern the channel after the current (RPC/Button) state
 // converges with the timespec.
-// It returns the current state of the relay.
+static void channel_timespec(int idx) {
-static bool channel_timespec(int idx) {
   bool match;
 
   if (idx < 0 || idx >= channel_get_total()) {
-    return false;
+    return;
   }
+  if (timespec_empty(s_channels[idx].timespec)) {
+    return;
+  }
+
   match = timespec_match_now(s_channels[idx].timespec);
   if (!s_channels[idx].channel_override) {
     // Follow timespec
     if (match == s_channels[idx].relay_state) {
-      return s_channels[idx].relay_state == 1;
+      return;
     }
     LOG(LL_INFO, ("Timespec drives channel %d to relay_state %d", idx, match));
     channel_set(idx, match);
@@ -272,11 +276,11 @@ static bool channel_timespec(int idx) {
     if (match == s_channels[idx].relay_state) {
       LOG(LL_INFO, ("User state agrees with timespec, clearing override"));
       s_channels[idx].channel_override = false;
-      return s_channels[idx].relay_state == 1;
+      return;
     }
   }
 
-  return s_channels[idx].relay_state == 1;
+  return;
 }
 
 static void channel_timespec_cb(void *arg) {

src/rpc.c

@@ -180,7 +180,6 @@ static void rpc_timespec_clear_handler(struct mg_rpc_request_info *ri, void *cb_
     ri = NULL;
     return;
   }
-  channel_override_set(idx);
 
   snprintf(fn, sizeof(fn) - 1, "timespec.chan%d", idx);
   unlink(fn);
@@ -217,7 +216,6 @@ static void rpc_timespec_add_handler(struct mg_rpc_request_info *ri, void *cb_ar
     ri = NULL;
     goto exit;
   }
-  channel_override_set(idx);
 
   snprintf(fn, sizeof(fn) - 1, "timespec.chan%d", idx);
   if (!timespec_write_file(ts, fn)) {