131 lines
No EOL
3.9 KiB
C
131 lines
No EOL
3.9 KiB
C
#include "encoding.h"
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#include <prstlib/macros.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_DECLARE(ble, LOG_LEVEL_INF);
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int prst_ble_encode_service_data(const prst_sensors_t* sensors,
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const bt_addr_le_t* bt_addr, uint8_t* out,
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uint8_t out_len) {
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RET_CHECK(out_len >= CONFIG_PRST_BLE_ENCODING_SERVICE_DATA_LEN,
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"Buffer is not large enough");
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#if CONFIG_PRST_BLE_ENCODING_BPARASITE_V2
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// 0x181a - Environmental sensing service UUID.
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out[0] = 0x1a;
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out[1] = 0x18;
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// Four bits for the protocol version.
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out[2] |= (2 << 4) & 0xf0;
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// Bit 0 of byte 0 specifies whether or not ambient light data exists in the
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// payload.
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#if DT_NODE_EXISTS(DT_NODELABEL(photo_transistor)) || DT_NODE_EXISTS(DT_NODELABEL(ldr))
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out[2] |= 1;
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#endif
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// 4 bits for a small wrap-around counter for deduplicating messages on the
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// receiver.
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// out[3] = sensors->run_counter & 0x0f;
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out[4] = sensors->batt.millivolts >> 8;
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out[5] = sensors->batt.millivolts & 0xff;
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int16_t temp_centicelsius = 100 * sensors->shtc3.temp_c;
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out[6] = temp_centicelsius >> 8;
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out[7] = temp_centicelsius & 0xff;
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uint16_t humi = sensors->shtc3.rel_humi * UINT16_MAX;
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out[8] = humi >> 8;
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out[9] = humi & 0xff;
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uint16_t soil_moisture = sensors->soil.percentage * UINT16_MAX;
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out[10] = soil_moisture >> 8;
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out[11] = soil_moisture & 0xff;
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// MAC address in big-endian.
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memcpy(out + 12, bt_addr->a.val, BT_ADDR_SIZE);
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out[18] = sensors->photo.brightness >> 8;
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out[19] = sensors->photo.brightness & 0xff;
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// https://bthome.io/v1/
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#elif CONFIG_PRST_BLE_ENCODING_BTHOME_V1
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// 0x181c - User data service UUID.
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out[0] = 0x1c;
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out[1] = 0x18;
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// 1. Soil moisture.
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// uint16_t.
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out[2] = (0b000 << 5) | 3;
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// Type of measurement - Moisture.
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out[3] = 0x14;
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// Value. Factor of 0.01, so we need to multiply our the value in 100% by
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// 1/0.01 = 100.
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uint16_t soil_val = 10000 * sensors->soil.percentage;
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out[4] = soil_val & 0xff;
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out[5] = soil_val >> 8;
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// 2. Temp.
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// int16_t.
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out[6] = (0b001 << 5) | 3;
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// Type of measurement - temperature.
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out[7] = 0x02;
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// Value. Factor 0.01.
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int16_t temp_val = 100 * sensors->shtc3.temp_c;
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out[8] = temp_val & 0xff;
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out[9] = temp_val >> 8;
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// 3. Humidity
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// uint16_t.
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out[10] = (0b000 << 5) | 3;
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// Type - humidity.
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out[11] = 0x03;
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// Value. Factor 0.01, over 100%.
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uint16_t humi_val = 10000 * sensors->shtc3.rel_humi;
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out[12] = humi_val & 0xff;
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out[13] = humi_val >> 8;
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// 4. Battery voltage.
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// uint16_t.
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out[14] = (0b000 << 5) | 3;
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// Type - voltage.
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out[15] = 0x0c;
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// Value. Factor of 0.001.
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uint16_t batt_val = sensors->batt.millivolts;
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out[16] = batt_val & 0xff;
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out[17] = batt_val >> 8;
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// https://bthome.io/format/
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#elif CONFIG_PRST_BLE_ENCODING_BTHOME_V2
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// 0xfcd2 - bthome.io service UUID.
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out[0] = 0xd2;
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out[1] = 0xfc;
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// Service header - no encryption, bt home v2.
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out[2] = 0x40;
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// Temperature.
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out[3] = 0x02;
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int16_t temp_val = 100 * sensors->shtc3.temp_c;
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out[4] = temp_val & 0xff;
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out[5] = temp_val >> 8;
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// Humidity.
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out[6] = 0x03;
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// Value. Factor 0.01, over 100%.
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uint16_t humi_val = 10000 * sensors->shtc3.rel_humi;
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out[7] = humi_val & 0xff;
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out[8] = humi_val >> 8;
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// Illuminance.
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out[9] = 0x05;
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out[10] = sensors->photo.brightness >> 16;
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out[11] = (sensors->photo.brightness >> 8) & 0xff;
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out[12] = sensors->photo.brightness & 0xff;
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// Battery voltage.
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out[13] = 0x0c;
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// Value. Factor of 0.001.
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uint16_t batt_val = sensors->batt.millivolts;
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out[14] = batt_val & 0xff;
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out[15] = batt_val >> 8;
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// Soil moisture.
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out[16] = 0x14;
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// Factor of 0.01, so we need to multiply our the value in 100% by 1/0.01 = 100.
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uint16_t soil_val = 10000 * sensors->soil.percentage;
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out[17] = soil_val & 0xff;
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out[18] = soil_val >> 8;
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#endif // Encoding protocols
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LOG_HEXDUMP_DBG(out, out_len, "Encoded BLE adv: ");
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return 0;
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} |