Communicate two microcontrollers via BLE

[msu7xi]

Hello,

I'm using a nRF52 DK to test BLE communication with another microcontroller. What I need to test is the nRF52 pairing with another brand microcontroller, send a data stream and close the connection.

Could you please tell me which example from the Bluetooth samples list I can use for starting?

Thanks for your attention.

Regards,

[msu7xi]

Hello Vidar Berg ,

In order to send data to the ESP32 the frame format explained in this link must be followed. I've modified the main function as follows to send 7 bytes of data within a frame 12 bytes of length:

void main(void)
{
	int err;
	struct uart_data_t buffer;
	uint8_t byte_0 = 0x4D /* Type */, byte_1 = 0x0 /* Frame control */, byte_2 = 0x0/* Sequence number */, byte_3 = 0x7 /* Data length */, byte_4 = 'A' /* Data */, byte_5 = 2 /* Checksum */;
	err = bt_conn_auth_cb_register(&conn_auth_callbacks);
	if (err) {
		LOG_ERR("Failed to register authorization callbacks.");
		return;
	}
	printk("bt_conn_auth_cb_register\n");

	err = bt_conn_auth_info_cb_register(&conn_auth_info_callbacks);
	printk("bt_conn_auth_info_cb_register err: %i\n", err);
	if (err) {
		printk("Failed to register authorization info callbacks.\n");
		return;
	}

	err = bt_enable(NULL);
	printk("bt_enable err: %i\n", err);
	if (err) {
		LOG_ERR("Bluetooth init failed (err %d)", err);
		printk("Bluetooth init failed (err %d)\n", err);
		return;
	}
	printk("Bluetooth initialized\n");
	LOG_INF("Bluetooth initialized");

	if (IS_ENABLED(CONFIG_SETTINGS)) {
		settings_load();
	}

	int (*module_init[])(void) = {uart_init, scan_init, nus_client_init};
	for (size_t i = 0; i < ARRAY_SIZE(module_init); i++) {
		err = (*module_init[i])();
		//printk("i: %i\n", i);
		if (err) {
			return;
		}
	}
	printk("\n");

	printk("Starting Bluetooth Central UART example\n");

	err = bt_scan_start(BT_SCAN_TYPE_SCAN_ACTIVE);
	if (err) {
		LOG_ERR("Scanning failed to start (err %d)", err);
		printk("Scanning failed to start (err %d)\n", err);
		return;
	}

	LOG_INF("Scanning successfully started");
	printk("Scanning successfully started\n");

	for (;;) {
		/* Wait indefinitely for data to be sent over Bluetooth */
		buffer.data[0] = byte_0;
		buffer.data[1] = byte_1;
		buffer.data[2] = byte_2;
		buffer.data[3] = byte_3;
		buffer.data[4] = byte_4;
		buffer.data[5] = 'B';
		buffer.data[6] = 'C';
		buffer.data[7] = 'D';
		buffer.data[8] = 'E';
		buffer.data[9] = 'F';
		buffer.data[10] = byte_2;

		buffer.data[11] = byte_5;
		buffer.len = 12;

		if (discovery_service_ok)
		{
			err = bt_nus_client_send(&nus_client, buffer.data, buffer.len);
			if (err) {
				LOG_WRN("Failed to send data over BLE connection"
					"(err %d)", err);
				printk("Failed to send data over BLE connection"
					"(err %d)\n", err);
			}

			if (err) {
				LOG_WRN("NUS send timeout");
				printk("NUS send timeout\n");
			}
			byte_2++; /* Increment sequence number. */
		}
		k_msleep(1000); 
	}
}