Kconfigure BLE service data length

code/nrf-connect/Kconfig

@@ -12,7 +12,7 @@ config PRST_NETWORK_BLE
     bool "Uses BLE as the network"
     depends on BT
 
-endchoice
+endchoice  # PRST_NETWORK
 
 ###
 ### BLE configs
@@ -29,4 +29,11 @@ config PRST_BLE_ENCODING_BPARASITE_V2
 config PRST_BLE_ENCODING_BTHOME
 	bool "Uses the BTHome (bthome.io) BLE encoding"
 
-endchoice
+endchoice  # PRST_BLE_ENCODING
+
+config PRST_BLE_ENCODING_SERVICE_DATA_LEN
+	int
+	help
+		Size of the service data buffer
+	default 20 if PRST_BLE_ENCODING_BPARASITE_V2
+	default 18 if PRST_BLE_ENCODING_BTHOME

code/nrf-connect/src/prst/ble/ble.c

@@ -9,7 +9,7 @@
 
 LOG_MODULE_REGISTER(ble, LOG_LEVEL_DBG);
 
-static uint8_t service_data[PRST_BLE_ENCODING_SERVICE_DATA_LEN] = {0};
+static uint8_t service_data[CONFIG_PRST_BLE_ENCODING_SERVICE_DATA_LEN] = {0};
 
 static const struct bt_data ad[] = {
     BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),

code/nrf-connect/src/prst/ble/encoding.c

@@ -9,46 +9,40 @@ LOG_MODULE_DECLARE(ble, LOG_LEVEL_DBG);
 int prst_ble_encode_service_data(const prst_sensors_t* sensors,
                                  const bt_addr_le_t* bt_addr, uint8_t* out,
                                  uint8_t out_len) {
-  RET_CHECK(out_len >= PRST_BLE_ENCODING_SERVICE_DATA_LEN,
+  RET_CHECK(out_len >= CONFIG_PRST_BLE_ENCODING_SERVICE_DATA_LEN,
             "Buffer is not large enough");
 
-  // 0x181c - BTHome Service UUID.
-  out[0] = 0x1c;
+#if CONFIG_PRST_BLE_ENCODING_BPARASITE_V2
+  // 0x181a - Environmental sensing service UUID.
+  out[0] = 0x1a;
   out[1] = 0x18;
-
-  // Soil Moisture.
-  //
   // Four bits for the protocol version.
   out[2] |= (2 << 4) & 0xf0;
-
   // Bit 0 of byte 0 specifies whether or not ambient light data exists in the
   // payload.
   out[2] |= 1;
-
   // 4 bits for a small wrap-around counter for deduplicating messages on the
   // receiver.
   // out[3] = sensors->run_counter & 0x0f;
-
   out[4] = sensors->batt.millivolts >> 8;
   out[5] = sensors->batt.millivolts & 0xff;
-
   int16_t temp_centicelsius = 100 * sensors->shtc3.temp_c;
   out[6] = temp_centicelsius >> 8;
   out[7] = temp_centicelsius & 0xff;
-
   uint16_t humi = sensors->shtc3.rel_humi * UINT16_MAX;
   out[8] = humi >> 8;
   out[9] = humi & 0xff;
-
   uint16_t soil_moisture = sensors->soil.percentage * UINT16_MAX;
   out[10] = soil_moisture >> 8;
   out[11] = soil_moisture & 0xff;
-
   // MAC address in big-endian.
   memcpy(out + 12, bt_addr->a.val, BT_ADDR_SIZE);
-
   out[18] = sensors->photo.brightness >> 8;
   out[19] = sensors->photo.brightness & 0xff;
+#elif CONFIG_PRST_BLE_ENCODING_BTHOME
+  // TODO.
+  memset(out, 0xab, out_len);
+#endif  // Enccoding protocols
 
   return 0;
 }

code/nrf-connect/src/prst/ble/encoding.h

@@ -5,8 +5,6 @@
 
 #include "prst/data.h"
 
-#define PRST_BLE_ENCODING_SERVICE_DATA_LEN 20
-
 int prst_ble_encode_service_data(const prst_sensors_t* sensors,
                                  const bt_addr_le_t* bt_addr, uint8_t* out,
                                  uint8_t out_len);