Add support for PN7160 (#5486)

esphome/components/nfc/nfc_helpers.cpp

@@ -0,0 +1,47 @@
+#include "nfc_helpers.h"
+
+namespace esphome {
+namespace nfc {
+
+static const char *const TAG = "nfc.helpers";
+
+bool has_ha_tag_ndef(NfcTag &tag) { return !get_ha_tag_ndef(tag).empty(); }
+
+std::string get_ha_tag_ndef(NfcTag &tag) {
+  if (!tag.has_ndef_message()) {
+    return std::string();
+  }
+  auto message = tag.get_ndef_message();
+  auto records = message->get_records();
+  for (const auto &record : records) {
+    std::string payload = record->get_payload();
+    size_t pos = payload.find(HA_TAG_ID_PREFIX);
+    if (pos != std::string::npos) {
+      return payload.substr(pos + sizeof(HA_TAG_ID_PREFIX) - 1);
+    }
+  }
+  return std::string();
+}
+
+std::string get_random_ha_tag_ndef() {
+  static const char ALPHANUM[] = "0123456789abcdef";
+  std::string uri = HA_TAG_ID_PREFIX;
+  for (int i = 0; i < 8; i++) {
+    uri += ALPHANUM[random_uint32() % (sizeof(ALPHANUM) - 1)];
+  }
+  uri += "-";
+  for (int j = 0; j < 3; j++) {
+    for (int i = 0; i < 4; i++) {
+      uri += ALPHANUM[random_uint32() % (sizeof(ALPHANUM) - 1)];
+    }
+    uri += "-";
+  }
+  for (int i = 0; i < 12; i++) {
+    uri += ALPHANUM[random_uint32() % (sizeof(ALPHANUM) - 1)];
+  }
+  ESP_LOGD("pn7160", "Payload to be written: %s", uri.c_str());
+  return uri;
+}
+
+}  // namespace nfc
+}  // namespace esphome