Default name = MAC; brief wake on boot; drop dead touch defences

- Seed viewport_name with the full base MAC, colons stripped
  (e8:f6:0a:e0:90:94 → "e8f60ae09094"). Stable across reboots, globally
  unique, 12 alphanumeric chars — well inside the mDNS hostname limit
  even with the "viewport-" prefix.
- Add a mac_str field to viewport_state and expose it as the new "mac"
  key in GET /state and as a "mac" line on the info screen.
- "Configured" no longer requires a viewport_name (it always has the
  MAC default); the scrypted URL alone gates outbound POSTs and the
  loading-vs-info screen choice.
- Strip viewport_name[0] fallbacks in http_api / mdns / local_screens
  now that the field is never empty.
- Replace the wake-on-boot-stays-on behaviour with a ~600 ms flash
  followed by sleep — long enough for the FT5426 touch IC to come out
  of its initial unresponsive state, short enough that an idle device
  doesn't burn the backlight.
- Drop the touch defensive cruft added when we were chasing a PoE-power
  theory: the DEV_MODE=0x00 write at init, the touch_reset_pulse() call
  at init, and the runtime wedge-self-heal in the polling loop didn't
  actually fix anything — the wake-on-boot flash did. Also delete the
  display_touch_reset_pulse() helper since it now has zero callers.

1 files changed, 20 insertions, 0 deletions

diff --git a/main/viewport_state.c b/main/viewport_state.c
index 7ddf737..a67745a 100644
--- a/main/viewport_state.c
+++ b/main/viewport_state.c
@@ -1,7 +1,9 @@
 #include "viewport_state.h"
 
+#include <stdio.h>
 #include <string.h>
 
+#include "esp_mac.h"
 #include "esp_timer.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/semphr.h"
@@ -9,6 +11,22 @@
 static viewport_state_t s_state;
 static SemaphoreHandle_t s_mutex;
 
+// Populate viewport_name with the full base MAC, colons stripped
+// (e.g. e8:f6:0a:e0:90:94 → "e8f60ae09094"). Stable across reboots,
+// globally unique, and 12 alphanumeric chars — fits comfortably under
+// the 32-char mDNS hostname limit with the "viewport-" prefix.
+// POST /config can override it with a friendlier name.
+static void seed_mac_and_name(char *mac_str, size_t mac_cap,
+                              char *name,    size_t name_cap)
+{
+    uint8_t mac[6] = {0};
+    esp_read_mac(mac, ESP_MAC_BASE);
+    snprintf(mac_str, mac_cap, "%02x:%02x:%02x:%02x:%02x:%02x",
+             mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+    snprintf(name, name_cap, "%02x%02x%02x%02x%02x%02x",
+             mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+}
+
 void viewport_state_init(void)
 {
     memset(&s_state, 0, sizeof(s_state));
@@ -19,6 +37,8 @@ void viewport_state_init(void)
     s_state.orientation     = VIEWPORT_ORIENTATION_PORTRAIT;
     s_state.boot_us         = (uint64_t)esp_timer_get_time();
     s_state.last_frame_us   = -1;
+    seed_mac_and_name(s_state.mac_str,       sizeof(s_state.mac_str),
+                      s_state.viewport_name, sizeof(s_state.viewport_name));
 
     s_mutex = xSemaphoreCreateMutex();
 }