In 'peripheral_uart', where does the BLE Tx data go?

RE: In 'peripheral_uart', where does the BLE Tx data go?

Vidar Berg — Tue, 16 Jan 2024 07:17:22 GMT

You need to use the bt_nus_send() function if you wish to send BLE notifications to the phone. The uart_tx() function is from the UART driver.

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Mon, 15 Jan 2024 17:46:57 GMT

I just realized that the code I have been modifying (lesson 4 exercise 3) is supposed to be sending it to the terminal (based on the comment on the code). I am interrupting that data and chaining it to my text. Now I need to figure out how to interrupt the reception of data from the terminal and allow my data to be sent out instead.

static void bt_receive_cb(struct bt_conn *conn, const uint8_t *const data, uint16_t len)
{
	int err;
	char addr[BT_ADDR_LE_STR_LEN] = { 0 };

	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, ARRAY_SIZE(addr));

	LOG_INF("Received data from: %s", addr);

	for (uint16_t pos = 0; pos != len;) {
		struct uart_data_t *tx = k_malloc(sizeof(*tx));

		if (!tx) {
			LOG_WRN("Not able to allocate UART send data buffer");
			return;
		}

		/* Keep the last byte of TX buffer for potential LF char. */
		size_t tx_data_size = sizeof(tx->data) - 1;

		if ((len - pos) > tx_data_size) {
			tx->len = tx_data_size;
		} else {
			tx->len = (len - pos);
		}

		memcpy(tx->data, &data[pos], tx->len);

		pos += tx->len;

		/* Append the LF character when the CR character triggered
		 * transmission from the peer.
		 */
		if ((pos == len) && (data[len - 1] == '\r')) {
			tx->data[tx->len] = '\n';
			tx->len++;
		}
		/* STEP 8.3 - Forward the data received over Bluetooth LE to the UART peripheral */
		err = uart_tx(uart, tx->data, tx->len, SYS_FOREVER_MS);
		if (err) {
			k_fifo_put(&fifo_uart_tx_data, tx);
		}
	}
}

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Mon, 15 Jan 2024 17:35:56 GMT

I am now triggering of the reception of the matched scan. That is working well. I send my data out but it does not go where I want it to go. It goes to the Terminal on my computer. I do not want it there! I want it to go to the Norid_UART_Service on my iPhone. I don't understand how it could be possibly going the terminal.

RE: In 'peripheral_uart', where does the BLE Tx data go?

Vidar Berg — Mon, 15 Jan 2024 11:22:17 GMT

As mentioned in the other ticket, you can use the bt_nus_send() function to send your data.

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Thu, 11 Jan 2024 16:45:27 GMT

Yes, it was a great place to start. I'm almost done. I have just a few things left. The current problem is that I want to send data out on the UART when advertising matches my filter. Currently it only sends out UART data when it receives data as a trigger.

RE: In 'peripheral_uart', where does the BLE Tx data go?

Vidar Berg — Thu, 11 Jan 2024 16:16:22 GMT

I see. Yes, the serial port emulation demonstrated by this sample might not exactly match your use case. However, I still believe the sample could be a good starting point for your requirements as it should be relatively easy to modify. You can modify the application so that it doesn't just blindly relay data received on the UART interface (or remove the UART com. altogether).

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Thu, 11 Jan 2024 15:22:36 GMT

Yes, I am seeing the messages from my serial terminal in the iOS toolbox log. But, that is not what I am trying to see (this is the BLE Rx signal). I was expecting to see the Tx output there (but it is what is going into the BLE Rx). The only place I see the BLE Tx output is on the terminal of my computer. I guess that is good enough for me. I was hoping to see on my iPhone screen somewhere.

RE: In 'peripheral_uart', where does the BLE Tx data go?

Vidar Berg — Wed, 10 Jan 2024 14:13:51 GMT

Thanks for the clarification. But are you not seeing the messages sent from the serial terminal in your iOS toolbox log?

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Wed, 10 Jan 2024 14:05:28 GMT

On my computer (using the Serial Terminal (v1.20)), when I type in something in the "Type and press enter to send" box and then hit return it only prints what I sent (in green on the terminal). I don't think it ever makes it to my Bluetooth Rx input. The only way I can see anything from the output of the Bluetooth (on the terminal in Windows) is to send a preset on my iPhone (like you described). I would have thought a command I send from the Serial Terminal on my computer would do the same thing that I see when I send a Command (like your "Hello" from the iPhone) but it doesn't.

At least have the one part working so and I can continue. Now I just need to figure out how to send my data instead of a scrambled (done on purpose on the nRF chip) test message.

Best regards,

Sheldon

RE: In 'peripheral_uart', where does the BLE Tx data go?

Vidar Berg — Wed, 10 Jan 2024 13:21:32 GMT

Hello Sheldon,

Thank you for the update. Yes, the Peripheral UART sample is configured to relay any data it receives on its UART RX input to the connected BLE device (your iPhone in this case). Similarly, it will output any data receives from the connected Bluetooth central to the UART TX output and the terminal.

[quote user=""]When I type something into the serial terminal I see that it makes it to my iPhone (it is in green text) followed by a "received" message. But this, now I think, is just what is coming in (what the Rx would see). Where is the Bluetooth Tx output?[/quote]

To send the data in the other direction (i..e, from the phone), you can create Create a preset in the nRF Toolbox app for the command you want to send as I have tried to show below.

When pressing the '1' button in the above example, the text string "Hello" should be sent from the iPhone to the peripheral and then printed out on the serial terminal.

[quote user="Sheldon01"]

I enter on the terminal don't go the Bluetooth Rx input (or at least I never see them coming out on the terminal in 'non-green' form.

Sheldon

[/quote]

Are you referring to the log in the phone app?

Best regards,

Vidar

RE: In 'peripheral_uart', where does the BLE Tx data go?

Sheldon01 — Wed, 10 Jan 2024 13:16:45 GMT

There's nothing like answering your own question...

I think I have it figured out. The output goes to the Terminal (on the computer). If I send text using a 'preset' value in the UART (from the nRF Toolbox on my iPhone) and scramble it up (just for a test) I can see the result on the Terminal on my computer. When I type something on the Terminal, however, it doesn't get to the Bluetooth chip (not that I can tell). It prints the unaltered value in green on the display. I don't understand why things I enter on the terminal don't go the Bluetooth Rx input (or at least I never see them coming out on the terminal in 'non-green' form.

Sheldon