Tap the card on the charger and the number fills itself in

The enrolment the Anker app does, done here: 0108 a2=7 opens the reader,
0908 brings back the UID. The frames this sends are byte-for-byte the
ones the app was captured sending — checksum included — which is what the
new test asserts.

Adding and removing now write the charger as well as the account: the
device write is the app's own message, the account write is the inferred
one that carries the name, and either may fail without the other.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Web App/web/src/api.js

@@ -345,6 +345,13 @@ export const api = {
       method: "POST",
       body: JSON.stringify({ cardNumber, cardName }),
     }),
+  // Opens the charger's own card reader and waits for a tap — the request is in
+  // flight for the whole twenty-second window, and answers whether or not a card
+  // arrived.
+  scanAnkerRfidCard: (sn) =>
+    request(`/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/rfid-cards/scan`, {
+      method: "POST",
+    }),
   deleteAnkerRfidCard: (sn, cardNumber) =>
     request(
       `/integrations/anker-solix/chargers/${encodeURIComponent(sn)}/rfid-cards/${encodeURIComponent(cardNumber)}`,

Web App/web/src/i18n/da.json

@@ -69,6 +69,10 @@
       "none": "Ingen kort er godkendt til denne lader.",
       "unsupported": "Tjenesten, som denne lader kommer fra, rapporterer ikke RFID-kort.",
       "add": "Tilføj kort",
+      "tap": "Hold kortet mod laderen",
+      "tapping": "Hold kortet mod læseren… {n}s",
+      "tapHint": "Læseren er åben. Hold kortet mod laderen.",
+      "tapNone": "Der blev ikke holdt et kort mod læseren, før den lukkede.",
       "addTitle": "Tilføj et kort",
       "remove": "Fjern",
       "removeConfirm": "Fjern {name} fra denne lader?",

Web App/web/src/i18n/en.json

@@ -338,6 +338,10 @@
       "none": "No cards are authorised on this charger.",
       "unsupported": "The service this charger came from does not report RFID cards.",
       "add": "Add card",
+      "tap": "Tap card at the charger",
+      "tapping": "Hold the card against the reader… {n}s",
+      "tapHint": "The reader is open. Hold the card against the charger.",
+      "tapNone": "No card was tapped before the reader closed.",
       "addTitle": "Add a card",
       "remove": "Remove",
       "removeConfirm": "Remove {name} from this charger?",

Web App/web/src/i18n/pl.json

@@ -69,6 +69,10 @@
       "none": "Na tej ładowarce nie autoryzowano żadnej karty.",
       "unsupported": "Usługa, z której pochodzi ta ładowarka, nie zgłasza kart RFID.",
       "add": "Dodaj kartę",
+      "tap": "Przyłóż kartę do ładowarki",
+      "tapping": "Przytrzymaj kartę przy czytniku… {n}s",
+      "tapHint": "Czytnik jest otwarty. Przytrzymaj kartę przy ładowarce.",
+      "tapNone": "Nie przyłożono karty, zanim czytnik się zamknął.",
       "addTitle": "Dodaj kartę",
       "remove": "Usuń",
       "removeConfirm": "Usunąć {name} z tej ładowarki?",

Web App/web/src/views/Charging.vue

@@ -1242,7 +1242,8 @@ const rfidCards = computed(() => {
   return rfidCardsFrom(view?.attrs);
 });
 
-const rfidBusy = ref(""); // the card being written, or "new" while one is added
+const rfidBusy = ref(""); // the card being written, "new", or "scan" while the reader is open
+const rfidCountdown = ref(0); // seconds left of the reader's window, while it is open
 const rfidError = ref("");
 const newCardNumber = ref("");
 const newCardName = ref("");
@@ -1272,6 +1273,35 @@ async function addRfidCard() {
   }
 }
 
+// Asking the charger to read a card, which is what the Anker app's second way of
+// adding one does: the reader opens for twenty seconds, and whatever is held
+// against it comes back as a number. Nothing is written by this — the card lands
+// in the form, and adding it is still a decision.
+async function scanRfidCard() {
+  const sn = detailSn.value;
+  if (!sn || rfidBusy.value) return;
+  rfidBusy.value = "scan";
+  rfidError.value = "";
+  rfidCountdown.value = 20;
+  const tick = setInterval(() => {
+    rfidCountdown.value = Math.max(0, rfidCountdown.value - 1);
+  }, 1000);
+  try {
+    const res = await api.scanAnkerRfidCard(sn);
+    if (res?.tapped && res.card) {
+      newCardNumber.value = res.card;
+    } else {
+      rfidError.value = t("charging.rfid.tapNone");
+    }
+  } catch (e) {
+    rfidError.value = e.message;
+  } finally {
+    clearInterval(tick);
+    rfidCountdown.value = 0;
+    rfidBusy.value = "";
+  }
+}
+
 // Removing one asks first — a card that is gone can only be put back by whoever
 // still has it in their hand.
 async function removeRfidCard(card) {
@@ -1877,6 +1907,18 @@ onMounted(async () => {
                   {{ rfidBusy === "new" ? t("common.loading") : t("charging.rfid.add") }}
                 </button>
               </div>
+              <!-- The other way to fill that field in: hold the card against the
+                   charger. The reader opens for twenty seconds and the number
+                   arrives on its own, which beats reading it off the card. -->
+              <button
+                type="button"
+                class="dh-btn dh-btn-ghost mt-2 w-full text-xs"
+                :disabled="rfidBusy !== ''"
+                @click="scanRfidCard"
+              >
+                {{ rfidBusy === "scan" ? t("charging.rfid.tapping", { n: rfidCountdown }) : t("charging.rfid.tap") }}
+              </button>
+              <p v-if="rfidBusy === 'scan'" class="mt-1 text-[11px] text-muted">{{ t("charging.rfid.tapHint") }}</p>
             </form>
             <p class="mt-3 text-[11px] text-muted">{{ t("charging.rfid.inferred") }}</p>
           </div>