From 29b9dc798d6aaa53801110ca4e9c76b16ea4db1e Mon Sep 17 00:00:00 2001
From: GOB <goblin52@gmail.com>
Date: Sun, 21 Dec 2025 18:40:57 +0900
Subject: [PATCH] Add READ_SIG for emulation

---
 src/nfc/layer/a/emulation_layer_a.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/nfc/layer/a/emulation_layer_a.cpp b/src/nfc/layer/a/emulation_layer_a.cpp
index 69c06f2..7141cf4 100644
--- a/src/nfc/layer/a/emulation_layer_a.cpp
+++ b/src/nfc/layer/a/emulation_layer_a.cpp
@@ -17,6 +17,7 @@ using namespace m5::nfc::a::mifare;
 using namespace m5::nfc::a::mifare::classic;
 
 namespace {
+constexpr uint8_t dummy_signature[32] = {};
 
 }  // namespace
 
@@ -159,6 +160,14 @@ EmulationLayerA::State EmulationLayerA::receive_callback(const uint8_t* rx, cons
                 }
             }
         } break;
+        case Command::READ_SIG:
+            if (_picc.isNTAG() || _picc.type == Type::MIFARE_Ultralight_EV1_1 ||
+                _picc.type == Type::MIFARE_Ultralight_EV1_2 || _picc.type == Type::MIFARE_Ultralight_Nano) {
+                if (rx_len == 2 && rx[1] == 0x00 /*RFU*/) {
+                    ret = _impl->transmit(dummy_signature, sizeof(dummy_signature), 4) ? State::Active : State::None;
+                }
+            }
+            break;
 
         default:
             break;