I am using the cloud string variable to transmit 622 bytes of binary data. On encode I make sure I am only using byte values 1-255 to not compromise the string. My question is now how to decode the JSON string back to the binary data. This are some of the JSON encoded return messages: { "cmd": "V…

Have a look at this thread with a similar problem [image] [Resolved] Exposed function receiving the wrong values? Troubleshooting After doing some searching it seems that the byte string is being encoded into (most likely) UTF…

From that post: After doing some searching it seems that the byte string is being encoded into (most likely) UTF-8, can only handle values up to 128 for a single byte. From Python 2.7.9 docs: UTF-8 uses the following rules: 1) If the code point is <128, it’s represented by the corresponding byte …

I now generated a string with 255 characters 0x01- 0xff and requested it back from the cloud. Very strange results, here are the real values reaching the socket: \u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\…

You binary data is getting encoded: \u0001 = 0x01 \u0002 = 0x02 … \b = 0x08 \t = 0x09 \n = 0x0A etc. You should encode your binary data before sending it using only printable ASCII characters. There are a number of schemes for doing this but base64 encoding is probably the most common. Tha…

@bko : thanks for confirming that the string cloud function only transmits the lower 7-bit ASCII table. Using base64 is in my case not the ideal option because it uses only 6-bits. I will encode my data into 0x01-0x7f then.

Hello, When you send a String through the spark cloud it gets encoded to UTF-8. This encoding only works for byte values between 0x00 and 0x7f (or 127 in decimal). When it encodes a value higher than 127, it turns it into multiple bytes to conform to the standard. If possible, I would highly sugge…

Unfortunalety all values higher than 127 are mapped to the same sequence (239)(191)(189) as written further up in my post. TCP is only an option for the local network and will not work in the WAN. I need a solution that works outside the local network as well. It is kludgy but I am now using 7 bit e…

How to decode JSON string in PHP or Java

Cloud

ScruffR January 26, 2015, 8:27pm 2

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How to decode JSON string in PHP or Java

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