Base 256 encoding in Particle publishes

Moors7 · October 22, 2018, 4:04pm

It's in that very post I linked to

github.com/particle-iot/device-os

[Electron/Photon/P1] Increase Device OS API argument lengths

particle-iot:develop ← particle-iot:feature/increase-limits

opened 12:02AM - 04 May 18 UTC

technobly

+342 -201

### Problem Device OS API arguments have limitations that can be increased. … ### Solution | API Field | Prior to 0.8.0 | Since 0.8.0 | Comment | |--:|--:|--:|:--| | Variable Key | 12 | 64 | | | Variable Data | 622 | 622 | | | Function Key | 12 | 64 | | | Function Argument | 63 | 622 | | | Publish/Subscribe Event Name | 64 | 64 | | | Publish/Subscribe Event Data | 255 | 622 | ~Cloud API currently still limits to 255, but Device OS can publish 622. Will change Cloud API to accept 622.~ Done. | | Number of registered Functions or Variables | limited by memory available | limited by memory available | | An additional feature has been added that will return `false` when attempting to register a `Particle.variable()` or `Particle.function()` that exceeds the memory limits of the describe message (about 800 bytes for the Photon/P1/Electron). This message is a JSON object that describes or lists the "keys" needed. When an error occurs, that Variable or Function will be removed from the list available. ### Steps to Test Included test app. ### Example App ```c #include "Particle.h" #define PUB_70 "123456789012345678901234567890123456789012345678901234567890ABCDEFGHIJ" #define SUB_70 "123456789012345678901234567890123456789012345678901234567890ABCDEFGHIJ" #define VAR_70 "123456789012345678901234567890123456789012345678901234567890ABCDEFGHIJ" #define VAR_64 "123456789012345678901234567890123456789012345678901234567890ABCD" #define VAR_63 "123456789012345678901234567890123456789012345678901234567890ABC" #define VAR_62 "123456789012345678901234567890123456789012345678901234567890AB" #define VAR_61 "123456789012345678901234567890123456789012345678901234567890A" #define VAR_60 "123456789012345678901234567890123456789012345678901234567890" #define VAR_13 "1234567890123" #define VAR_12 "123456789012" #define VAR_OVF "12345678901234567890123456789012345678901234567890" #define FUN_70 "123456789012345678901234567890123456789012345678901234567890ABCDEFGHIJ" #define FUN_64 "123456789012345678901234567890123456789012345678901234567890ABCD" #define FUN_63 "123456789012345678901234567890123456789012345678901234567890ABC" #define FUN_62 "123456789012345678901234567890123456789012345678901234567890AB" #define FUN_61 "123456789012345678901234567890123456789012345678901234567890A" #define FUN_60 "123456789012345678901234567890123456789012345678901234567890" #define FUN_13 "1234567890123" #define FUN_12 "123456789012" #define CHAR_700 "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJ" #define CHAR_622 "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890AB" String my_variable_ovf = CHAR_622; String my_variable_12 = CHAR_622; String my_variable_13 = CHAR_622; String my_variable_60 = CHAR_622; String my_variable_61 = CHAR_622; String my_variable_62 = CHAR_622; String my_variable_63 = CHAR_622; String my_variable_64 = CHAR_622; String my_variable_70 = CHAR_700; Serial1LogHandler logHandler(115200, LOG_LEVEL_ALL); void handler(const char *event, const char *data) { String my_event(event); String my_data(data); Serial.printlnf("Event Length: %d, Data Length: %d", my_event.length(), my_data.length() ); Serial.printlnf("Event Name: %s, Event Data: %s", my_event.c_str(), my_data.c_str() ); } void printInfo(String& string) { Serial.printlnf("Function Argument Length: %d", string.length() ); Serial.printlnf("Function Argument: %s", string.c_str() ); } int my_function_70(String arg) { printInfo(arg); return 0; } int my_function_64(String arg) { printInfo(arg); return 0; } int my_function_63(String arg) { printInfo(arg); return 0; } int my_function_62(String arg) { printInfo(arg); return 0; } int my_function_61(String arg) { printInfo(arg); return 0; } int my_function_60(String arg) { printInfo(arg); return 0; } int my_function_50(String arg) { printInfo(arg); return 0; } int my_function_13(String arg) { printInfo(arg); return 0; } int my_function_12(String arg) { printInfo(arg); return 0; } int my_function_ovf(String arg) { printInfo(arg); return 0; } void setup() { Serial.begin(); // Particle.function(FUN_70, my_function_70); // error on compile (error shows 64 limit) Particle.function(FUN_12, my_function_12); // can receive 622 bytes as an argument Particle.function(FUN_13, my_function_13); // can receive 622 bytes as an argument Particle.function(FUN_60, my_function_60); // can receive 622 bytes as an argument Particle.function(FUN_61, my_function_61); // can receive 622 bytes as an argument Particle.function(FUN_62, my_function_62); // can receive 622 bytes as an argument Particle.function(FUN_63, my_function_63); // can receive 622 bytes as an argument Particle.function(FUN_64, my_function_64); // can receive 622 bytes as an argument // Particle.variable(VAR_70, &my_variable_70, STRING); // error on compile (error shows 64 limit) Particle.variable(VAR_12, &my_variable_12, STRING); // returns CHAR_622 Particle.variable(VAR_13, &my_variable_13, STRING); // returns CHAR_622 Particle.variable(VAR_60, &my_variable_60, STRING); // returns CHAR_622 Particle.variable(VAR_61, &my_variable_61, STRING); // returns CHAR_622 Particle.variable(VAR_62, &my_variable_62, STRING); // returns CHAR_622 Particle.variable(VAR_63, &my_variable_63, STRING); // returns CHAR_622 Particle.variable(VAR_64, &my_variable_64, STRING); // returns CHAR_622 // Particle.variable(VAR_OVF, &my_variable_ovf, STRING); // add to increase describe message over the limit Particle.subscribe(SUB_70, handler, MY_DEVICES); // event 64 and data 255 (limited by Cloud API) waitUntil(Particle.connected); Particle.publish(PUB_70, CHAR_700, PRIVATE, WITH_ACK); // event 64 and data 622 } void loop() { } ``` ### References Closes #1467 --- ### Completeness - [x] User is totes amazing for contributing! - [x] Contributor has signed CLA ([Info here](https://github.com/spark/firmware/blob/develop/CONTRIBUTING.md)) - [x] Problem and Solution clearly stated - [x] Run unit/integration/application tests on device - [x] Added documentation - [x] Added to CHANGELOG.md after merging (add links to docs and issues)

Topic		Replies	Views
Particle.publish() = 622bytes? Cloud	32	1046	September 22, 2021
How to control character set used by Particle.publish? Firmware	5	1572	August 5, 2016
How to publish binary data Firmware	2	1350	September 20, 2017
Particle Function max characters Cloud	13	1992	August 8, 2018
Particle.publish() max length is 256 not 622 Firmware argon	6	492	April 29, 2021

Base 256 encoding in Particle publishes

Related topics