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try to implement uart over ble

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write is working (print into log), but notify doesn't work yet

Signed-off-by: Peter Siegmund <mars3142@users.noreply.github.com>
This commit is contained in:
Peter Siegmund
2025-08-29 11:50:13 +02:00
parent 63ed36094d
commit 8bf9e8f462
4 changed files with 226 additions and 114 deletions
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70
firmware/components/remote_control/uart_service.c Normal file
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#include "include/uart_service.h"
static const char *TAG = "uart_service";
// Service UUID: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E
const ble_uuid128_t gatt_svr_svc_uart_uuid =
BLE_UUID128_INIT(0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x01, 0x00, 0x40, 0x6E);
// RX Characteristic UUID: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E
const ble_uuid128_t gatt_svr_chr_uart_rx_uuid =
BLE_UUID128_INIT(0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x02, 0x00, 0x40, 0x6E);
// TX Characteristic UUID: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E
const ble_uuid128_t gatt_svr_chr_uart_tx_uuid =
BLE_UUID128_INIT(0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x03, 0x00, 0x40, 0x6E);
uint16_t conn_handle;
uint16_t tx_chr_val_handle;
// Callback function for GATT events (read/write on characteristics)
int gatt_svr_chr_uart_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg)
{
switch (ctxt->op)
{
case BLE_GATT_ACCESS_OP_WRITE_CHR:
// Check if the RX characteristic is being written to
// if (ble_uuid_cmp((const ble_uuid_t *)&ctxt->chr->uuid, (const ble_uuid_t *)&gatt_svr_chr_uart_rx_uuid) == 0)
{
// Get data from the buffer
uint16_t data_len = OS_MBUF_PKTLEN(ctxt->om);
char *data = (char *)malloc(data_len + 1);
if (data)
{
int rc = ble_hs_mbuf_to_flat(ctxt->om, data, data_len, NULL);
if (rc == 0)
{
data[data_len] = '\0';
ESP_LOGI(TAG, "Received data: %s", data);
}
free(data);
}
return 0;
}
break;
default:
break;
}
return BLE_ATT_ERR_UNLIKELY;
}
// Function to send data via the TX characteristic
void send_ble_data(const char *data)
{
if (conn_handle != 0)
{ // Only send when connected
struct os_mbuf *om = ble_hs_mbuf_from_flat(data, strlen(data));
if (om)
{
int rc = ble_gatts_notify_custom(conn_handle, tx_chr_val_handle, om);
if (rc == 0)
{
ESP_LOGI(TAG, "Sent data: %s", data);
}
else
{
ESP_LOGE(TAG, "Error sending data: %d", rc);
}
}
}
}