Rename struct mg_connection::label -> data. Make its size configurable

examples/zephyr/device-dashboard/src/net.c

@@ -78,7 +78,7 @@ static struct user *getuser(struct mg_http_message *hm) {
 static void send_notification(struct mg_mgr *mgr, const char *fmt, ...) {
   struct mg_connection *c;
   for (c = mgr->conns; c != NULL; c = c->next) {
-    if (c->label[0] == 'W') {
+    if (c->data[0] == 'W') {
       va_list ap;
       va_start(ap, fmt);
       mg_ws_vprintf(c, WEBSOCKET_OP_TEXT, fmt, &ap);
@@ -201,7 +201,7 @@ void device_dashboard_fn(struct mg_connection *c, int ev, void *ev_data,
       }
       mg_http_reply(c, 200, "", "ok\n");
     } else if (mg_http_match_uri(hm, "/api/watch")) {
-      c->label[0] = 'W';  // Mark ourselves as a event listener
+      c->data[0] = 'W';  // Mark ourselves as a event listener
       mg_ws_upgrade(c, hm, NULL);
     } else if (mg_http_match_uri(hm, "/api/login")) {
       mg_http_reply(c, 200, NULL, "{%Q:%Q,%Q:%Q}\n", "user", u->name, "token",

examples/zephyr/http-client/src/main.c

@@ -16,10 +16,10 @@ static bool done = false;
 // Print HTTP response and signal that we're done
 static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
   if (ev == MG_EV_OPEN) {
-    // Connection created. Store connect expiration time in c->label
-    *(int64_t *) c->label = mg_millis() + s_timeout_ms;
+    // Connection created. Store connect expiration time in c->data
+    *(int64_t *) c->data = mg_millis() + s_timeout_ms;
   } else if (ev == MG_EV_POLL) {
-    if (mg_millis() > *(int64_t *) c->label &&
+    if (mg_millis() > *(int64_t *) c->data &&
         (c->is_connecting || c->is_resolving)) {
       mg_error(c, "Connect timeout");
     }

examples/zephyr/mqtt-aws-client/src/main.c

@@ -32,13 +32,13 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
     MG_INFO(("Connected to %s", s_url));
     MG_INFO(("Subscribing to %s", s_rx_topic));
     mg_mqtt_sub(c, topic, s_qos);
-    c->label[0] = 'X';  // Set a label that we're logged in
+    c->data[0] = 'X';  // Set a label that we're logged in
   } else if (ev == MG_EV_MQTT_MSG) {
     // When we receive MQTT message, print it
     struct mg_mqtt_message *mm = (struct mg_mqtt_message *) ev_data;
     MG_INFO(("Received on %.*s : %.*s", (int) mm->topic.len, mm->topic.ptr,
              (int) mm->data.len, mm->data.ptr));
-  } else if (ev == MG_EV_POLL && c->label[0] == 'X') {
+  } else if (ev == MG_EV_POLL && c->data[0] == 'X') {
     static unsigned long prev_second;
     unsigned long now_second = (*(unsigned long *) ev_data) / 1000;
     if (now_second != prev_second) {