new: if ui.fps is set to 0, the display will only be updated for major data changes

sdcard/rootfs/root/pwnagotchi/config.yml

@@ -91,7 +91,10 @@ personality:
 
 # ui configuration
 ui:
-    # ePaper display can update every 3 secs anyway
+    # ePaper display can update every 3 secs anyway, set to 0 to only refresh for major data changes
+    # IMPORTANT: The lifespan of an eINK display depends on the cumulative amount of refreshes. If you want to
+    # preserve your display over time, you should set this value to 0.0 so that the display will be refreshed only
+    # if any of the important data fields changed (the uptime and blinking cursor won't trigger a refresh).
     fps: 0.3
     display:
         enabled: true

sdcard/rootfs/root/pwnagotchi/scripts/pwnagotchi/agent.py

@@ -347,13 +347,13 @@ class Agent(Client, AsyncAdvertiser, AsyncTrainer):
                     if key not in self._handshakes:
                         self._handshakes[key] = h
                         new_shakes += 1
-                        apsta = self._find_ap_sta_in(sta_mac, ap_mac, s)
-                        if apsta is None:
+                        ap_and_station = self._find_ap_sta_in(sta_mac, ap_mac, s)
+                        if ap_and_station is None:
                             core.log("!!! captured new handshake: %s !!!" % key)
                             self._last_pwnd = ap_mac
                             plugins.on('handshake', self, filename, ap_mac, sta_mac)
                         else:
-                            (ap, sta) = apsta
+                            (ap, sta) = ap_and_station
                             self._last_pwnd = ap['hostname'] if ap['hostname'] != '' and ap[
                                 'hostname'] != '<hidden>' else ap_mac
                             core.log("!!! captured new handshake on channel %d: %s (%s) -> %s [%s (%s)] !!!" % ( \

sdcard/rootfs/root/pwnagotchi/scripts/pwnagotchi/ui/state.py

@@ -6,9 +6,11 @@ class State(object):
         self._state = state
         self._lock = Lock()
         self._listeners = {}
+        self._changes = {}
 
     def add_element(self, key, elem):
         self._state[key] = elem
+        self._changes[key] = True
 
     def add_listener(self, key, cb):
         with self._lock:
@@ -22,10 +24,29 @@ class State(object):
         with self._lock:
             return self._state[key].value if key in self._state else None
 
+    def reset(self):
+        with self._lock:
+            self._changes = {}
+
+    def changes(self, ignore=()):
+        with self._lock:
+            changes = []
+            for change in self._changes.keys():
+                if change not in ignore:
+                    changes.append(change)
+            return changes
+
+    def has_changes(self):
+        with self._lock:
+            return len(self._changes) > 0
+
     def set(self, key, value):
         with self._lock:
             if key in self._state:
                 prev = self._state[key].value
                 self._state[key].value = value
-                if key in self._listeners and self._listeners[key] is not None and prev != value:
+
+                if prev != value:
+                    self._changes[key] = True
+                    if key in self._listeners and self._listeners[key] is not None:
                         self._listeners[key](prev, value)

sdcard/rootfs/root/pwnagotchi/scripts/pwnagotchi/ui/view.py

@@ -78,7 +78,6 @@ class View(object):
                                    label_font=fonts.Bold,
                                    text_font=fonts.Medium),
 
-
             'line1': Line([0, int(self._height * .12), self._width, int(self._height * .12)], color=BLACK),
             'line2': Line(
                 [0, self._height - int(self._height * .12), self._width, self._height - int(self._height * .12)],
@@ -111,7 +110,12 @@ class View(object):
 
         plugins.on('ui_setup', self)
 
+        if config['ui']['fps'] > 0.0:
             _thread.start_new_thread(self._refresh_handler, ())
+            self._ignore_changes = ()
+        else:
+            core.log("ui.fps is 0, the display will only update for major changes")
+            self._ignore_changes = ('uptime', 'name')
 
     def add_element(self, key, elem):
         self._state.add_element(key, elem)
@@ -311,6 +315,8 @@ class View(object):
 
     def update(self):
         with self._lock:
+            changes = self._state.changes(ignore=self._ignore_changes)
+            if len(changes):
                 self._canvas = Image.new('1', (self._width, self._height), WHITE)
                 drawer = ImageDraw.Draw(self._canvas)
 
@@ -321,3 +327,5 @@ class View(object):
 
                 for cb in self._render_cbs:
                     cb(self._canvas)
+
+                self._state.reset()