B4R Question Does B4R have a way of reading JSON files?

[RHays]

Sorry, still new to this, and I have been looking but have not seen much. I want to pull data from Dark Sky API and get the current weather where I am at. If I have to build something I will look into it but I did not want to reinvent the wheel if it is already there. I saw a library out there for B4J, and I know B4R is new. So if anyone can point me in the right direction.

Thanks
Rick

 

[Erel]

The problem is not that B4R is new. Parsing JSON on a microcontroller with very limited memory is problematic. You can easily run out of memory.

If the json string is simple enough then you can use ByteConverter string methods to parse it.

 

[warwound]

I used ArduinoJson library in a project based on a Mega2560 (programming in the arduino IDE) and it worked very well.
On microcontrollers with less memory there could be problems but the Mega2560 has loads of memory.

I've not got into b4r, preferring the arduino IDE.
Can the above library be used in b4r?

 

[Erel]

Can the above library be used in b4r?

Any Arduino library can be added to B4R.

 

[Erel]

@warwound you should give B4R a try. It is especially powerful when you combine it with other B4X tools.
In that case you should use B4RSerializator with AsyncStreams to easily send data.

 

[RHays]

Thanks everyone for your suggestion, as said kinda new to all this, I will look at this ArduinoJson. I will also look at the ByteConverter as suggested to see if that will get me by, as yes micro is small and so is the memory, something else I have to get use too.

Can I suggest a simple JSON library for the arduino, as more boards are becoming wifi enabled (ESP8266, ESP32, etc.) and it is very common to get data returned from API's as JSON, just a basic parser to an object.

I found this on the web: https://blog.squix.org/2016/10/esp8266-weather-station-color-code-published.html. This looked like fun, and gave me a goal. I have not looked at the code nor do I want too. I just want to take there idea and build it. I get my weather from Dark Sky API, this is a JSON return data string.

So I may have more questions in the future but for now thanks for the help.

Thanks
Rick

 

[Erel]

I get my weather from Dark Sky API, this is a JSON return data string.

Post an example. Might be simple to parse with ByteConverter.

 

[RHays]

This is from: https://darksky.net/dev/docs/forecast

----------

When you send this to Dark Sky API
https://api.darksky.net/forecast/0123456789abcdef9876543210fedcba/42.3601,-71.0589

----------

You get this back from the API

{
"latitude": 47.20296790272209,
"longitude": -123.41670367098749,
"timezone": "America/Los_Angeles",
"currently": {
"time": 1453402675,
"summary": "Rain",
"icon": "rain",
"nearestStormDistance": 0,
"precipIntensity": 0.1685,
"precipIntensityError": 0.0067,
"precipProbability": 1,
"precipType": "rain",
"temperature": 48.71,
"apparentTemperature": 46.93,
"dewPoint": 47.7,
"humidity": 0.96,
"windSpeed": 4.64,
"windBearing": 186,
"visibility": 4.3,
"cloudCover": 0.73,
"pressure": 1009.7,
"ozone": 328.35
},
"minutely": {
"summary": "Rain for the hour.",
"icon": "rain",
"data": [
{
"time": 1453402620,
"precipIntensity": 0.1715,
"precipIntensityError": 0.0066,
"precipProbability": 1,
"precipType": "rain"
},
...
]
},
"hourly": {
"summary": "Rain throughout the day.",
"icon": "rain",
"data": [
{
"time": 1453399200,
"summary": "Rain",
"icon": "rain",
"precipIntensity": 0.1379,
"precipProbability": 0.85,
"precipType": "rain",
"temperature": 48.16,
"apparentTemperature": 46.41,
"dewPoint": 46.89,
"humidity": 0.95,
"windSpeed": 4.47,
"windBearing": 166,
"visibility": 3.56,
"cloudCover": 0.39,
"pressure": 1009.97,
"ozone": 328.71
},
...
]
},
"daily": {
"summary": "Light rain throughout the week, with temperatures bottoming out at 48°F on Sunday.",
"icon": "rain",
"data": [
{
"time": 1453363200,
"summary": "Rain throughout the day.",
"icon": "rain",
"sunriseTime": 1453391560,
"sunsetTime": 1453424361,
"moonPhase": 0.43,
"precipIntensity": 0.1134,
"precipIntensityMax": 0.1722,
"precipIntensityMaxTime": 1453392000,
"precipProbability": 0.87,
"precipType": "rain",
"temperatureMin": 41.42,
"temperatureMinTime": 1453363200,
"temperatureMax": 53.27,
"temperatureMaxTime": 1453417200,
"apparentTemperatureMin": 36.68,
"apparentTemperatureMinTime": 1453363200,
"apparentTemperatureMax": 53.27,
"apparentTemperatureMaxTime": 1453417200,
"dewPoint": 46.79,
"humidity": 0.95,
"windSpeed": 4.26,
"windBearing": 150,
"visibility": 4.02,
"cloudCover": 0.77,
"pressure": 1009.35,
"ozone": 326.69
},
...
]
},
"alerts": [
{
"title": "Flood Watch for Mason, WA",
"time": 1453375020,
"expires": 1453407300,
"description": "...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE FRIDAY NIGHT...\nTHE FLOOD WATCH CONTINUES FOR\n* A PORTION OF NORTHWEST WASHINGTON...INCLUDING THE FOLLOWING\nCOUNTY...MASON.\n* THROUGH LATE FRIDAY NIGHT\n* A STRONG WARM FRONT WILL BRING HEAVY RAIN TO THE OLYMPICS\nTONIGHT THROUGH THURSDAY NIGHT. THE HEAVY RAIN WILL PUSH THE\nSKOKOMISH RIVER ABOVE FLOOD STAGE TODAY...AND MAJOR FLOODING IS\nPOSSIBLE.\n* A FLOOD WARNING IS IN EFFECT FOR THE SKOKOMISH RIVER. THE FLOOD\nWATCH REMAINS IN EFFECT FOR MASON COUNTY FOR THE POSSIBILITY OF\nAREAL FLOODING ASSOCIATED WITH A MAJOR FLOOD.\n",
"uri": "http://alerts.weather.gov/cap/wwaca...WA.SEWFFASEW.38e78ec64613478bb70fc6ed9c87f6e6"
},
...
],
{
"flags": {
"units": "us",
...
}
}

 

[Erel]

You will not be able to connect to a https url.

It will be much easier to use a Raspberry Pi or a similar small computer for this task.

 

[pappicio]

This is from: https://darksky.net/dev/docs/forecast

----------

When you send this to Dark Sky API
https://api.darksky.net/forecast/0123456789abcdef9876543210fedcba/42.3601,-71.0589

----------

You get this back from the API

{
"latitude": 47.20296790272209,
"longitude": -123.41670367098749,
"timezone": "America/Los_Angeles",
"currently": {
"time": 1453402675,
"summary": "Rain",
"icon": "rain",
"nearestStormDistance": 0,
"precipIntensity": 0.1685,
"precipIntensityError": 0.0067,
"precipProbability": 1,
"precipType": "rain",
"temperature": 48.71,
"apparentTemperature": 46.93,
"dewPoint": 47.7,
"humidity": 0.96,
"windSpeed": 4.64,
"windBearing": 186,
"visibility": 4.3,
"cloudCover": 0.73,
"pressure": 1009.7,
"ozone": 328.35
},
"minutely": {
"summary": "Rain for the hour.",
"icon": "rain",
"data": [
{
"time": 1453402620,
"precipIntensity": 0.1715,
"precipIntensityError": 0.0066,
"precipProbability": 1,
"precipType": "rain"
},
...
]
},
"hourly": {
"summary": "Rain throughout the day.",
"icon": "rain",
"data": [
{
"time": 1453399200,
"summary": "Rain",
"icon": "rain",
"precipIntensity": 0.1379,
"precipProbability": 0.85,
"precipType": "rain",
"temperature": 48.16,
"apparentTemperature": 46.41,
"dewPoint": 46.89,
"humidity": 0.95,
"windSpeed": 4.47,
"windBearing": 166,
"visibility": 3.56,
"cloudCover": 0.39,
"pressure": 1009.97,
"ozone": 328.71
},
...
]
},
"daily": {
"summary": "Light rain throughout the week, with temperatures bottoming out at 48°F on Sunday.",
"icon": "rain",
"data": [
{
"time": 1453363200,
"summary": "Rain throughout the day.",
"icon": "rain",
"sunriseTime": 1453391560,
"sunsetTime": 1453424361,
"moonPhase": 0.43,
"precipIntensity": 0.1134,
"precipIntensityMax": 0.1722,
"precipIntensityMaxTime": 1453392000,
"precipProbability": 0.87,
"precipType": "rain",
"temperatureMin": 41.42,
"temperatureMinTime": 1453363200,
"temperatureMax": 53.27,
"temperatureMaxTime": 1453417200,
"apparentTemperatureMin": 36.68,
"apparentTemperatureMinTime": 1453363200,
"apparentTemperatureMax": 53.27,
"apparentTemperatureMaxTime": 1453417200,
"dewPoint": 46.79,
"humidity": 0.95,
"windSpeed": 4.26,
"windBearing": 150,
"visibility": 4.02,
"cloudCover": 0.77,
"pressure": 1009.35,
"ozone": 326.69
},
...
]
},
"alerts": [
{
"title": "Flood Watch for Mason, WA",
"time": 1453375020,
"expires": 1453407300,
"description": "...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE FRIDAY NIGHT...\nTHE FLOOD WATCH CONTINUES FOR\n* A PORTION OF NORTHWEST WASHINGTON...INCLUDING THE FOLLOWING\nCOUNTY...MASON.\n* THROUGH LATE FRIDAY NIGHT\n* A STRONG WARM FRONT WILL BRING HEAVY RAIN TO THE OLYMPICS\nTONIGHT THROUGH THURSDAY NIGHT. THE HEAVY RAIN WILL PUSH THE\nSKOKOMISH RIVER ABOVE FLOOD STAGE TODAY...AND MAJOR FLOODING IS\nPOSSIBLE.\n* A FLOOD WARNING IS IN EFFECT FOR THE SKOKOMISH RIVER. THE FLOOD\nWATCH REMAINS IN EFFECT FOR MASON COUNTY FOR THE POSSIBILITY OF\nAREAL FLOODING ASSOCIATED WITH A MAJOR FLOOD.\n",
"uri": "http://alerts.weather.gov/cap/wwaca...WA.SEWFFASEW.38e78ec64613478bb70fc6ed9c87f6e6"
},
...
],
{
"flags": {
"units": "us",
...
}
}

I had same problem , then I used rhttputils, and job.response giva me all infos I need, I trucnate also all job.response, (around 2500 chrs, too large....) before and after, only to have less memory ovvupied by response and to have only data I need, works well!!!