Hieromon Ikasamo
6 years ago
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## Suppress increase in memory consumption |
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Custom Web page processing consumes a lot of memory. AutoConnect will take a whole string of the JSON document for the custom Web pages into memory. The required buffer size for the JSON document of example sketch *mqttRSSI* reaches approximately 3000 bytes. And actually, it needs twice the heap area. Especially this constraint will be a problem with the ESP8266 which has a heap size poor. |
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AutoConnect can handle custom Web pages without using JSON. In that case, since the ArduinoJson library will not be bound, the sketch size will also be reduced. |
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## Writing the custom Web pages without JSON |
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To handle a custom Web page without using JSON, follow the steps below. |
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1. Create or define [AutoConnectAux](apiaux.md) for each page. |
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2. Create or define [AutoConnectElement(s)](acelements.md). |
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3. Add [AutoConnectElement(s)](acelements.md) to AutoConnectAux. |
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4. Create more AutoConnectAux containing [AutoConnectElement(s)](acelements.md), if necessary. |
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5. Register the request handlers for the custom Web pages. |
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6. [Join](api.md#join) prepared AutoConnectAux(s) to AutoConnect. |
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7. Invoke [AutoConnect::begin()](api.md#begin). |
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In addition to the above procedure, to completely cut off for binding with the ArduinoJson library, turn off the ArduinoJson use indicator which is declared by the [AutoConnect definitions](api.md#defined-macros). Its declaration is in **AutoConnectDefs.h** file.[^1] |
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[^1]:Detaching the ArduinoJson library reduces the sketch size by approximately 10K bytes. |
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```cpp |
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// Comment out the AUTOCONNECT_USE_JSON macro to detach the ArduinoJson. |
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#define AUTOCONNECT_USE_JSON |
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``` |
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!!! caution "JSON processing will be disabled" |
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Commenting out the **AUTOCONNECT_USE_JSON** macro invalidates all functions related to JSON processing. If the sketch is using the JSON function, it will result in a compile error. |
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## Implementation example without ArduinoJson |
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The code excluding JSON processing from the mqttRSSI sketch attached to the library is as follows. <small>(It is a part of code. Refer to mqttRSSI_NA.ino for the whole sketch.)</small> |
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<i class="fa fa-code"></i> The JSON document for mqttRSSI |
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```json |
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[ |
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{ |
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"title": "MQTT Setting", |
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"uri": "/mqtt_setting", |
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"menu": true, |
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"element": [ |
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{ |
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"name": "header", |
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"type": "ACText", |
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"value": "<h2>MQTT broker settings</h2>", |
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"style": "text-align:center;color:#2f4f4f;padding:10px;" |
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}, |
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{ |
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"name": "caption", |
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"type": "ACText", |
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"value": "Publishing the WiFi signal strength to MQTT channel. RSSI value of ESP8266 to the channel created on ThingSpeak", |
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"style": "font-family:serif;color:#4682b4;" |
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}, |
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{ |
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"name": "mqttserver", |
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"type": "ACInput", |
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"value": "", |
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"label": "Server", |
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"pattern": "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$", |
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"placeholder": "MQTT broker server" |
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}, |
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{ |
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"name": "channelid", |
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"type": "ACInput", |
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"label": "Channel ID", |
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"pattern": "^[0-9]{6}$" |
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}, |
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{ |
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"name": "userkey", |
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"type": "ACInput", |
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"label": "User Key" |
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}, |
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{ |
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"name": "apikey", |
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"type": "ACInput", |
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"label": "API Key" |
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}, |
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{ |
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"name": "newline", |
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"type": "ACElement", |
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"value": "<hr>" |
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}, |
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{ |
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"name": "uniqueid", |
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"type": "ACCheckbox", |
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"value": "unique", |
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"label": "Use APID unique", |
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"checked": false |
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}, |
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{ |
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"name": "period", |
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"type": "ACRadio", |
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"value": [ |
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"30 sec.", |
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"60 sec.", |
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"180 sec." |
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], |
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"label": "Update period", |
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"arrange": "vertical", |
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"checked": 1 |
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}, |
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{ |
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"name": "newline", |
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"type": "ACElement", |
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"value": "<hr>" |
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}, |
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{ |
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"name": "hostname", |
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"type": "ACInput", |
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"value": "", |
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"label": "ESP host name", |
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"pattern": "^([a-zA-Z0-9]([a-zA-Z0-9-])*[a-zA-Z0-9]){1,32}$" |
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}, |
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{ |
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"name": "save", |
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"type": "ACSubmit", |
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"value": "Save&Start", |
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"uri": "/mqtt_save" |
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}, |
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{ |
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"name": "discard", |
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"type": "ACSubmit", |
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"value": "Discard", |
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"uri": "/" |
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} |
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] |
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}, |
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{ |
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"title": "MQTT Setting", |
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"uri": "/mqtt_save", |
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"menu": false, |
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"element": [ |
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{ |
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"name": "caption", |
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"type": "ACText", |
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"value": "<h4>Parameters saved as:</h4>", |
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"style": "text-align:center;color:#2f4f4f;padding:10px;" |
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}, |
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{ |
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"name": "parameters", |
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"type": "ACText" |
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}, |
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{ |
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"name": "clear", |
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"type": "ACSubmit", |
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"value": "Clear channel", |
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"uri": "/mqtt_clear" |
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} |
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] |
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} |
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] |
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``` |
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<span style="margin-right:6px;margin-top:2px;"><img align="middle" width="32" height="32" src="./images/arrow_down.png"></span><i class="fa fa-code"></i> Exclude the JSON and replace to the AutoConnectElements natively |
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```cpp |
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// In the declaration, |
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// Declare AutoConnectElements for the page asf /mqtt_setting |
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ACText(header, "<h2>MQTT broker settings</h2>", "text-align:center;color:#2f4f4f;padding:10px;"); |
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ACText(caption, "Publishing the WiFi signal strength to MQTT channel. RSSI value of ESP8266 to the channel created on ThingSpeak", "font-family:serif;color:#4682b4;"); |
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ACInput(mqttserver, "", "Server", "^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\\-]*[A-Za-z0-9])$", "MQTT broker server"); |
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ACInput(channelid, "", "Channel ID", "^[0-9]{6}$"); |
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ACInput(userkey, "", "User Key"); |
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ACInput(apikey, "", "API Key"); |
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ACElement(newline, "<hr>"); |
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ACCheckbox(uniqueid, "unique", "Use APID unique"); |
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ACRadio(period, { "30 sec.", "60 sec.", "180 sec." }, "Update period", AC_Vertical, 1); |
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ACSubmit(save, "Start", "mqtt_save"); |
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ACSubmit(discard, "Discard", "/"); |
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// Declare the custom Web page as /mqtt_setting and contains the AutoConnectElements |
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AutoConnectAux mqtt_setting("/mqtt_setting", "MQTT Setting", true, { |
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header, |
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caption, |
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mqttserver, |
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channelid, |
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userkey, |
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apikey, |
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newline, |
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uniqueid, |
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period, |
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newline, |
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save, |
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discard |
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}); |
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// Declare AutoConnectElements for the page as /mqtt_save |
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ACText(caption2, "<h4>Parameters available as:</h4>", "text-align:center;color:#2f4f4f;padding:10px;"); |
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ACText(parameters); |
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ACSubmit(clear, "Clear channel", "/mqtt_clear"); |
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// Declare the custom Web page as /mqtt_save and contains the AutoConnectElements |
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AutoConnectAux mqtt_save("/mqtt_save", "MQTT Setting", false, { |
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caption2, |
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parameters, |
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clear |
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}); |
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// In the setup(), |
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// Join the custom Web pages and performs begin |
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portal.join({ mqtt_setting, mqtt_save }); |
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portal.begin(); |
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``` |
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