message lenght from max msp

[andreatrona]

Hi all, I have an issue that I don't understand: I have to send a text that is in a json file through OSC from MaxMsp to Teensy to save it on SD card... but when the json file reach a size that i don't know the message is no longer received. Some advice about OSCMessage max size? Thanks

[adrianfreed]

What kind of Teensy are you using? Are you using serial over USB or ethernet? We dynamically allocate memory on the Teensy so there may be a failure there depending on which model of Teensy. The teensy IDE reports available memory when you finish compiling

On Jul 16, 2021, at 11:19, Andrea Trona @.***> wrote:

Hi all, I have an issue that I don't understand: I have to send a text that is in a json file through OSC from MaxMsp to Teensy to save it on SD card... but when the json file reach a size that i don't know the message is no longer received. Some advice about OSCMessage max size? Thanks

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[andreatrona]

[EDIT] Hi Adrian and thank you for your answer. I'm using a Teensy 3.5 and ethernet via Adafruit Ethernet FeatherWing. This is the report when I finish compiling:

Sketch uses 54564 bytes (10%) of program storage space. Maximum is 524288 bytes. Global variables use 11424 bytes (4%) of dynamic memory, leaving 250712 bytes for local variables. Maximum is 262136 bytes.

For a more clear explanation of what I'm doing. I send from max msp a char array (a json file serialized) to store it in an sd card. After stored, it can be read from a library that menage json object... So, when the char array that I send from max msp become long, it stop working. Attached there is the file that I want to send but it has reached a limit of size (testoSizeError.json)

/ I edited this replay because I publish it in a wrong way and at the same time I closed the issue, so I also reopened it :)/ I this way, all of this char can't arrives in my teensy.

Attached there is also a simple max patch that is ready to send json formatted text via OSC. OSC_sizeIssue.zip

Thanks a lot in advance. Andrea

[andreatrona]

Ok, I'm taking another way to do this. I'm trying to send nested osc message that correspond to the dictionary in max (that read a json file format); for every data that I'll receive on the teensy via osc, I will start building the json document and then, when I received all of the data I'll serialize the json document to the SD card. Hope it will work, I'll tell you if I have other issue.

thanks Adrian

[adrianfreed]

There is a limit called the MTU established by the W5500 in the ethernet Featherwing. It’s usually 1 or 2 thousand bytes.

Your data seems smaller than that so I am still mystified. Perhaps you can share the code so I can look reproduce.

On Jul 17, 2021, at 07:46, Andrea Trona @.***> wrote:

Hi Adrian and thank you for your answer. I'm using a Teensy 3.5 and ethernet via Adafruit Ethernet FeatherWing. This is the report when I finish compiling:

Sketch uses 54564 bytes (10%) of program storage space. Maximum is 524288 bytes. Global variables use 11424 bytes (4%) of dynamic memory, leaving 250712 bytes for local variables. Maximum is 262136 bytes.

For a more clear explanation of what I'm doing. I send from max msp a char array (a json file serialized) to store it in an sd card. After stored, they can be read from a library that menage json object... So, when the char array that I send from max msp become long, it stop working. Here the text that I want to send. This is the length reached that `{ "faro0" : { "red" : 1, "green" : 2, "blue" : 3, "dimmer" : 4, "strobo" : 5, "pan" : 6, "tilt" : 7 } , "faro1" : { "red" : 11, "green" : 12, "blue" : 13, "dimmer" : 14, "strobo" : 15, "pan" : 16, "tilt" : 17 } , "faro2" : { "red" : 21, "green" : 22, "blue" : 23, "dimmer" : 34, "strobo" : 25, "pan" : 26, "tilt" : 27 } , "faro3" : { "red" : 31, "green" : 32, "blue" : 33, "dimmer" : 34, "strobo" : 35, "pan" : 36, "tilt" : 37 } , "faro4" : { "red" : 41, "green" : 42, "blue" : 43, "dimmer" : 44, "strobo" : 45, "pan" : 46, "tilt" : 47 } , "faro5" : { "red" : 51, "green" : 52, "blue" : 53, "dimmer" : 54, "strobo" : 55, "pan" : 56, "tilt" : 57 } , "faro6" : { "red" : 61, "green" : 62, "blue" : 63, "dimmer" : 64, "strobo" : 65, "pan" : 66, "tilt" : 67 } , "faro7" : { "red" : 71, "green" : 72, "blue" : 73, "dimmer" : 74, "strobo" : 75, "pan" : 76, "tilt" : 77 } , "faro8" : { "red" : 81, "green" : 82, "blue" : 83, "dimmer" : 84, "strobo" : 85, "pan" : 86, "tilt" : 87 } , "faro9" : { "red" : 91, "green" : 92, "blue" : 93, "dimmer" : 94, "strobo" : 95, "pan" : 96, "tilt" : 97 } , "faro10" : { "red" : 1, "green" : 2, "blue" : 3, "dimmer" : 4, "strobo" : 5, "pan" : 6, "tilt" : 7 } , "faro11" : { "red" : 1, "green" : 2 }

} `

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[adrianfreed]

you could skip the OSC formatting altogether and send the JSON as a UDP packet from max. If that works I would suspect a problem with the string handling in the OSC library

On Jul 19, 2021, at 07:08, Andrea Trona @.***> wrote:

Ok, I'm taking another way to do this. I'm trying to send nested osc message that correspond to the dictionary in max (that read a json file format); for every data that I'll receive on the teensy via osc, I will start building the json document and then, when I received all of the data I'll serialize the json document to the SD card. Hope it will work, I'll tell you if I have other issue.

thanks Adrian

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[andreatrona]

Hi Adrian, I found the limit called MTU, it's about 1472 bytes for udp. When in my sketch i print the size of the incoming message, it's around this number.

Now I'm using a system that interpret and read osc tags and "route" the message in the right path.

Thanks for your replies and for developing this tools. Andrea

[andreatrona]

It's useful for me to understand the path because I need to create a json document with nested object through ArduinoJson library

bye