From 08c22d31a76776a39974a5d04a39f3a2dc050974 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 15 Apr 2025 14:37:59 +0200
Subject: tighten Bluetooth beacon routines

---
 sensor/sensor.ino | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

(limited to 'sensor/sensor.ino')

diff --git a/sensor/sensor.ino b/sensor/sensor.ino
index b9c13ab..f051b0b 100644
--- a/sensor/sensor.ino
+++ b/sensor/sensor.ino
@@ -63,9 +63,6 @@
 #define LEDC_CALM_PACE      3000
 #define LEDC_STRESSED_PACE  400
 
-// Bluetooth beacon
-#define BEACON_POWER  ESP_PWR_LVL_N12
-
 int stress = 0;
 
 bool touch_detected = false;
@@ -75,6 +72,7 @@ int pace = LEDC_STRESSED_PACE;
 bool fade_ended = false;
 bool fade_in = true;
 
+// pointer to control Bluetooth networking
 BLEAdvertising *pAdvertising;
 
 // Touch sensor callback
@@ -148,21 +146,25 @@ int getGapeAngle() {
   return ledcRead(LED_PIN);
 }
 
-// Construct Bluetooth beacon
-void setBeacon(int angle) {
+// Encode static Bluetooth beacon advertisement data
+void setBeaconAdvertisement() {
+  BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
+  oAdvertisementData.setName(BEACON_NAME);
+  pAdvertising->setAdvertisementData(oAdvertisementData);
+}
+
+// Encode variable Bluetooth beacon service data
+void setBeaconServiceData(int angle) {
   BLEEddystoneTLM EddystoneTLM;
   EddystoneTLM.setTemp(angle);
   log_i("Gape angle: %.2f°", EddystoneTLM.getTemp());
 
-  BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
   BLEAdvertisementData oScanResponseData = BLEAdvertisementData();
   oScanResponseData.setServiceData(BLEUUID(
     (uint16_t)0xFEAA),
     String(EddystoneTLM.getData().c_str(),
       EddystoneTLM.getData().length()));
 
-  oAdvertisementData.setName(BEACON_NAME);
-  pAdvertising->setAdvertisementData(oAdvertisementData);
   pAdvertising->setScanResponseData(oScanResponseData);
 }
 
@@ -171,21 +173,21 @@ void setup() {
   // enable logging to serial
   Serial.begin(115200);
   esp_log_level_set("*", ESP_LOG_DEBUG);
+  if (BEACON_UUID == "00000000-0000-0000-0000-000000000000")
+    Serial.println("Please set a deployment-wide unique BEACON_UUID");
 
   beginPace();
   beginTouchDetection();
 
   // setup Bluetooth
-  if (BEACON_UUID == "00000000-0000-0000-0000-000000000000")
-    log_w("Please set a unique BEACON_UUID");
-  BLEDevice::init("TLMBeacon");
-  BLEDevice::setPower(BEACON_POWER);
+  BLEDevice::init(BEACON_NAME);
   pAdvertising = BLEDevice::getAdvertising();
-  setBeacon(getGapeAngle());
+  setBeaconAdvertisement();
+  setBeaconServiceData(getGapeAngle());
   pAdvertising->start();
 }
 
 void loop() {
-  setBeacon(getGapeAngle());
+  setBeaconServiceData(getGapeAngle());
   delay(500);
 }
-- 
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