Hi, I am trying to find the best way to transfer 1k-2k data from IOS/Android app into the p1 module EEprom. Could this be done using the cloud with out going to ftp/https? Particle.publish() can do 255 bytes and particle.function() args give 63 chars. Is there any other ways? Thanks.

[image] sheng: The project only consist of ios/android app to Particle cloud to p1 module Is this an app you'll be writing yourself? Do these OSs not also come with TCP transport libraries? But sure you can break things up into chunks, but for binary data you'd need to encode it into somethi…

@ScruffR , I should said I don’t have much experience with TCP so coding maybe time consuming. To save on time, I was thinking the fastest way to get this project done. I was thinking how to encode in the app and decode it in the device to make it useful and save space. What I want to do is store …

[image] sheng: 255 bytes which make it perfect for the limit on the particle function call The data in a function call can only be 63 characters. The data in an event (Particle.publish) can be 255 bytes. Do you need 1 minute resolution on the time (or for instance, could you get by with 5 or…

@Ric , Thanks for correcting me, I will be using Particle.publish. I will be using 30 minute each entry, 1:00, 1:30, 2:00, 2:30… Base on my calculation, only 30 minute interval will fit into the available EEPROM, since I will be adding 2-3 bytes after the set timestamp.

Base on my math for 30 minute interval, there is 48 entry per day x 7 day = 336 entry for a 7 day schedule. Each entry used 5 bytes, hoping 2 bytes for the timestamp and 3 for other data, 336 entry x 5 bytes = 1,680 bytes which can fit into EEProm ( 2,047 bytes). Tricky part is converting the tim…

You should be able to encode the timestamp into two ascii characters. The hour (0-23) takes 5 bits, and the minute (0 or 30) would only take 1. The day of the week, expressed as a number 0-6 would only take 3 bits. So, for the time in pseudo code, timeValue = hour + (0 if on the hour, 32 if on the …

@Ric , from your pseudo code, it seem like the time take one ascii character. Please correct me if I am wrong, that mean I can leave the day of the week as 0-7 with out encoding and still give me 2 bytes. This will save some decoding on the device side. All I need is decode the time. Does this seem…

Yeah, that’s true, you can just send the day byte as one of the characters, ‘0’ through ‘6’. That would be simpler.

@sheng , what is in “the other 3 bytes”? Are these ascii values?

@peekay123 , the structure of one entry would look like “day,time,mode,temperature”. Example: Monday, 1:00, On, 75 F would be “1”,“ascii Char”,“1”,“75” = 5 bytes. I will have to map the ascii value to ascii char before I send to the device. Would this work or other way to accomplish this?

Best way to transfer 1k-2k from APP into EEprom?

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rickkas7 January 21, 2017, 12:53pm 19

The code in the first comment to this post might help explain how the EEPROM functions work with integers and strings, as it's not entirely obvious.

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Best way to transfer 1k-2k from APP into EEprom?

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