ggwave.js doesn't have much options like waver.js

[jitendra1607]

I am trying to receive a message on the web page (https://github.com/ggerganov/ggwave/blob/master/examples/arduino-rx-web/index-tmpl.html) without any success.

it works great with the waver android app using the following settings in screenshots.

But I could not find the same settings in ggwave.js. Please pay attention to the following console warning "[Deprecation] The ScriptProcessorNode is deprecated. Use AudioWorkletNode instead. (https://bit.ly/audio-worklet)"

[ggerganov]

I think the web page does not receive data from the microcontroller because of the frequency shift that we did.
Can you confirm that when you remove the shift (i.e. comment the line I told you in the previous issue) and use a normal speaker (not buzzer) you are able to receive data in the web page?

[jitendra1607]

I don't think so because 'https://waver.ggerganov.com/' is capturing data with the above settings as shown in screenshots. However 'https://ggwave-js.ggerganov.com/' is unable to capture data, and I couldn't find 'MT_FASTEST' in ggwave object from ggwave.js library.

[jitendra1607]

i tried to play 'https://user-images.githubusercontent.com/1991296/168469004-aeb9b9fe-cf81-4db7-b602-62e4ae659341.mp4' in a smartphone while the webpage 'https://ggwave-js.ggerganov.com/' opened in the laptop for capturing data. The webpage not capturing properly and show garbage data sometimes.

[ggerganov]

Hi, I just pushed a change to master that adds the MT protocols to the emscripten port of ggwave.

Additionally, there are now functions for setting the freqStart parameter of the protocols through JS:

ggwave/bindings/javascript/emscripten.cpp

Lines 120 to 130 in d029602

	emscripten::function("rxProtocolSetFreqStart", emscripten::optional_override(
	[](ggwave_ProtocolId protocolId,
	int freqStart) {
	ggwave_rxProtocolSetFreqStart(protocolId, freqStart);
	}));
	emscripten::function("txProtocolSetFreqStart", emscripten::optional_override(
	[](ggwave_ProtocolId protocolId,
	int freqStart) {
	ggwave_txProtocolSetFreqStart(protocolId, freqStart);
	}));

See an example here:

ggwave/examples/arduino-rx-web/index-tmpl.html

Lines 98 to 101 in d029602

	// If you applied a shift on the transmitter side, you need to apply the same shift on the receiver side:
	//ggwave.rxProtocolSetFreqStart(ggwave.ProtocolId.GGWAVE_PROTOCOL_MT_FASTEST, 24 + 48);

In the video that you posted, I was still trying out different settings so the protocol that I used is no longer supported.
Instead, you should use the MT protocols that are currently available in ggwave.

You cannot use https://ggwave-js.ggerganov.com/ to receive Fixed-length messages, because it is configured to listen for variable-length messages. See explanation here:

ggwave/include/ggwave/ggwave.h

Lines 105 to 115 in d029602

	// GGWave instance parameters
	//
	// If payloadLength <= 0, then GGWave will transmit with variable payload length
	// depending on the provided payload. Sound markers are used to identify the
	// start and end of the transmission.
	//
	// If payloadLength > 0, then the transmitted payload will be of the specified
	// fixed length. In this case, no sound markers are emitted and a slightly
	// different decoding scheme is applied. This is useful in cases where the
	// length of the payload is known in advance.
	//

---

You can use the https://arduino-rx.ggerganov.com/ example to receive MT messages with Fixed-length = 16 and DSS enabled.

My advice is to first try using the Waver app with MT protocol to send messages to https://arduino-rx.ggerganov.com/
Make sure that the Freq shift in your Waver app is disabled. Let me know if this works.

[jitendra1607]

@ggerganov I tried this and it is working very well. Thank you.