Add timer ID attribute, for safe cleanup in the scripted environment

src/net.c

@@ -224,6 +224,7 @@ struct mg_timer *mg_timer_add(struct mg_mgr *mgr, uint64_t milliseconds,
                               unsigned flags, void (*fn)(void *), void *arg) {
   struct mg_timer *t = (struct mg_timer *) calloc(1, sizeof(*t));
   mg_timer_init(&mgr->timers, t, milliseconds, flags, fn, arg);
+  t->id = mgr->timerid++;
   return t;
 }
 

src/net.h

@@ -25,12 +25,13 @@ struct mg_mgr {
   int dnstimeout;               // DNS resolve timeout in milliseconds
   bool use_dns6;                // Use DNS6 server by default, see #1532
   unsigned long nextid;         // Next connection ID
+  unsigned long timerid;        // Next timer ID
   void *userdata;               // Arbitrary user data pointer
   uint16_t mqtt_id;             // MQTT IDs for pub/sub
   void *active_dns_requests;    // DNS requests in progress
   struct mg_timer *timers;      // Active timers
-  void *priv;                   // Used by the experimental stack
-  size_t extraconnsize;         // Used by the experimental stack
+  void *priv;                   // Used by the MIP stack
+  size_t extraconnsize;         // Used by the MIP stack
 #if MG_ARCH == MG_ARCH_FREERTOS_TCP
   SocketSet_t ss;  // NOTE(lsm): referenced from socket struct
 #endif

src/timer.c

@@ -8,7 +8,7 @@
 
 void mg_timer_init(struct mg_timer **head, struct mg_timer *t, uint64_t ms,
                    unsigned flags, void (*fn)(void *), void *arg) {
-  struct mg_timer tmp = {ms, 0U, 0U, flags, fn, arg, *head};
+  struct mg_timer tmp = {0U, ms, 0U, 0U, flags, fn, arg, *head};
   *t = tmp;
   *head = t;
 }

src/timer.h

@@ -3,6 +3,7 @@
 #include "arch.h"
 
 struct mg_timer {
+  unsigned long id;         // Timer ID
   uint64_t period_ms;       // Timer period in milliseconds
   uint64_t prev_ms;         // Timestamp of a previous poll
   uint64_t expire;          // Expiration timestamp in milliseconds