ble_scanner.h

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#pragma once
 
#include <cinttypes>
#include <cstdio>
#include <ctime>
 
#include "esphome/core/component.h"
#include "esphome/components/esp32_ble_tracker/esp32_ble_tracker.h"
#include "esphome/components/text_sensor/text_sensor.h"
 
#ifdef USE_ESP32
 
namespace esphome::ble_scanner {
 
class BLEScanner final : public text_sensor::TextSensor,
                         public esp32_ble_tracker::ESPBTDeviceListener,
                         public Component {
 public:
  bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override {
    char addr_buf[MAC_ADDRESS_PRETTY_BUFFER_SIZE];
    // Escape special characters in the device name for valid JSON
    const char *name = device.get_name().c_str();
    char escaped_name[128];
    size_t pos = 0;
    for (; *name != '\0' && pos < sizeof(escaped_name) - 7; name++) {
      uint8_t c = static_cast<uint8_t>(*name);
      if (c == '"' || c == '\\') {
        escaped_name[pos++] = '\\';
        escaped_name[pos++] = c;
      } else if (c < 0x20) {
        pos += snprintf(escaped_name + pos, sizeof(escaped_name) - pos, "\\u%04x", c);
      } else {
        escaped_name[pos++] = c;
      }
    }
    escaped_name[pos] = '\0';
 
    char buf[256];
    snprintf(buf, sizeof(buf), "{\"timestamp\":%" PRId64 ",\"address\":\"%s\",\"rssi\":%d,\"name\":\"%s\"}",
             static_cast<int64_t>(::time(nullptr)), device.address_str_to(addr_buf), device.get_rssi(), escaped_name);
    this->publish_state(buf);
    return true;
  }
  void dump_config() override;
};
 
}  // namespace esphome::ble_scanner
 
#endif