Communicate two microcontrollers via BLE

Question

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 · Accepted Answer

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
");

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

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

printk("Starting Bluetooth Central UART example
");

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)
", err);
 return;
	}

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

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)
", err);
 }

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

Communicate two microcontrollers via BLE

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