306 lines
11 KiB
C++
306 lines
11 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2015 Adafruit Industries
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef _ADAFRUIT_MQTT_H_
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#define _ADAFRUIT_MQTT_H_
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#include "Arduino.h"
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#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_STM32_FEATHER)
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#define strncpy_P(dest, src, len) strncpy((dest), (src), (len))
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#define strncasecmp_P(f1, f2, len) strncasecmp((f1), (f2), (len))
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#endif
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#define ADAFRUIT_MQTT_VERSION_MAJOR 0
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#define ADAFRUIT_MQTT_VERSION_MINOR 17
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#define ADAFRUIT_MQTT_VERSION_PATCH 0
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// Uncomment/comment to turn on/off debug output messages.
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//#define MQTT_DEBUG
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// Uncomment/comment to turn on/off error output messages.
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#define MQTT_ERROR
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// Set where debug messages will be printed.
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#define DEBUG_PRINTER Serial
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// If using something like Zero or Due, change the above to SerialUSB
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// Define actual debug output functions when necessary.
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#ifdef MQTT_DEBUG
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#define DEBUG_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
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#define DEBUG_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
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#define DEBUG_PRINTBUFFER(buffer, len) { printBuffer(buffer, len); }
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#else
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#define DEBUG_PRINT(...) {}
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#define DEBUG_PRINTLN(...) {}
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#define DEBUG_PRINTBUFFER(buffer, len) {}
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#endif
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#ifdef MQTT_ERROR
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#define ERROR_PRINT(...) { DEBUG_PRINTER.print(__VA_ARGS__); }
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#define ERROR_PRINTLN(...) { DEBUG_PRINTER.println(__VA_ARGS__); }
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#define ERROR_PRINTBUFFER(buffer, len) { printBuffer(buffer, len); }
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#else
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#define ERROR_PRINT(...) {}
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#define ERROR_PRINTLN(...) {}
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#define ERROR_PRINTBUFFER(buffer, len) {}
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#endif
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// Use 3 (MQTT 3.0) or 4 (MQTT 3.1.1)
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#define MQTT_PROTOCOL_LEVEL 4
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#define MQTT_CTRL_CONNECT 0x1
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#define MQTT_CTRL_CONNECTACK 0x2
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#define MQTT_CTRL_PUBLISH 0x3
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#define MQTT_CTRL_PUBACK 0x4
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#define MQTT_CTRL_PUBREC 0x5
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#define MQTT_CTRL_PUBREL 0x6
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#define MQTT_CTRL_PUBCOMP 0x7
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#define MQTT_CTRL_SUBSCRIBE 0x8
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#define MQTT_CTRL_SUBACK 0x9
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#define MQTT_CTRL_UNSUBSCRIBE 0xA
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#define MQTT_CTRL_UNSUBACK 0xB
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#define MQTT_CTRL_PINGREQ 0xC
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#define MQTT_CTRL_PINGRESP 0xD
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#define MQTT_CTRL_DISCONNECT 0xE
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#define MQTT_QOS_1 0x1
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#define MQTT_QOS_0 0x0
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#define CONNECT_TIMEOUT_MS 6000
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#define PUBLISH_TIMEOUT_MS 500
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#define PING_TIMEOUT_MS 500
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#define SUBACK_TIMEOUT_MS 500
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// Adjust as necessary, in seconds. Default to 5 minutes.
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#define MQTT_CONN_KEEPALIVE 300
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// Largest full packet we're able to send.
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// Need to be able to store at least ~90 chars for a connect packet with full
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// 23 char client ID.
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#define MAXBUFFERSIZE (150)
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#define MQTT_CONN_USERNAMEFLAG 0x80
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#define MQTT_CONN_PASSWORDFLAG 0x40
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#define MQTT_CONN_WILLRETAIN 0x20
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#define MQTT_CONN_WILLQOS_1 0x08
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#define MQTT_CONN_WILLQOS_2 0x18
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#define MQTT_CONN_WILLFLAG 0x04
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#define MQTT_CONN_CLEANSESSION 0x02
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// how much data we save in a subscription object
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// and how many subscriptions we want to be able to track.
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#if defined (__AVR_ATmega32U4__) || defined(__AVR_ATmega328P__)
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#define MAXSUBSCRIPTIONS 5
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#define SUBSCRIPTIONDATALEN 20
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#else
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#define MAXSUBSCRIPTIONS 15
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#define SUBSCRIPTIONDATALEN 100
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#endif
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class AdafruitIO_MQTT; // forward decl
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//Function pointer that returns an int
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typedef void (*SubscribeCallbackUInt32Type)(uint32_t);
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// returns a double
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typedef void (*SubscribeCallbackDoubleType)(double);
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// returns a chunk of raw data
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typedef void (*SubscribeCallbackBufferType)(char *str, uint16_t len);
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// returns an io data wrapper instance
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typedef void (AdafruitIO_MQTT::*SubscribeCallbackIOType)(char *str, uint16_t len);
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extern void printBuffer(uint8_t *buffer, uint16_t len);
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class Adafruit_MQTT_Subscribe; // forward decl
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class Adafruit_MQTT {
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public:
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Adafruit_MQTT(const char *server,
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uint16_t port,
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const char *cid,
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const char *user,
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const char *pass);
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Adafruit_MQTT(const char *server,
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uint16_t port,
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const char *user = "",
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const char *pass = "");
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virtual ~Adafruit_MQTT() {}
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// Connect to the MQTT server. Returns 0 on success, otherwise an error code
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// that indicates something went wrong:
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// -1 = Error connecting to server
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// 1 = Wrong protocol
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// 2 = ID rejected
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// 3 = Server unavailable
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// 4 = Bad username or password
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// 5 = Not authenticated
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// 6 = Failed to subscribe
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// Use connectErrorString() to get a printable string version of the
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// error.
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int8_t connect();
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int8_t connect(const char *user, const char *pass);
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// Return a printable string version of the error code returned by
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// connect(). This returns a __FlashStringHelper*, which points to a
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// string stored in flash, but can be directly passed to e.g.
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// Serial.println without any further processing.
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const __FlashStringHelper* connectErrorString(int8_t code);
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// Sends MQTT disconnect packet and calls disconnectServer()
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bool disconnect();
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// Return true if connected to the MQTT server, otherwise false.
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virtual bool connected() = 0; // Subclasses need to fill this in!
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// Set MQTT last will topic, payload, QOS, and retain. This needs
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// to be called before connect() because it is sent as part of the
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// connect control packet.
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bool will(const char *topic, const char *payload, uint8_t qos = 0, uint8_t retain = 0);
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// Publish a message to a topic using the specified QoS level. Returns true
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// if the message was published, false otherwise.
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bool publish(const char *topic, const char *payload, uint8_t qos = 0);
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bool publish(const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos = 0);
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// Add a subscription to receive messages for a topic. Returns true if the
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// subscription could be added or was already present, false otherwise.
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// Must be called before connect(), subscribing after the connection
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// is made is not currently supported.
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bool subscribe(Adafruit_MQTT_Subscribe *sub);
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// Unsubscribe from a previously subscribed MQTT topic.
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bool unsubscribe(Adafruit_MQTT_Subscribe *sub);
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// Check if any subscriptions have new messages. Will return a reference to
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// an Adafruit_MQTT_Subscribe object which has a new message. Should be called
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// in the sketch's loop function to ensure new messages are recevied. Note
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// that subscribe should be called first for each topic that receives messages!
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Adafruit_MQTT_Subscribe *readSubscription(int16_t timeout=0);
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// Handle any data coming in for subscriptions and fires them off to the appropriate callback
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Adafruit_MQTT_Subscribe *handleSubscriptionPacket(uint16_t len);
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void processPackets(int16_t timeout);
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// Ping the server to ensure the connection is still alive.
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bool ping(uint8_t n = 1);
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protected:
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// Interface that subclasses need to implement:
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// Connect to the server and return true if successful, false otherwise.
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virtual bool connectServer() = 0;
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// Disconnect from the MQTT server. Returns true if disconnected, false otherwise.
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virtual bool disconnectServer() = 0; // Subclasses need to fill this in!
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// Send data to the server specified by the buffer and length of data.
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virtual bool sendPacket(uint8_t *buffer, uint16_t len) = 0;
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// Read MQTT packet from the server. Will read up to maxlen bytes and store
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// the data in the provided buffer. Waits up to the specified timeout (in
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// milliseconds) for data to be available.
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virtual uint16_t readPacket(uint8_t *buffer, uint16_t maxlen, int16_t timeout) = 0;
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// Read a full packet, keeping note of the correct length
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uint16_t readFullPacket(uint8_t *buffer, uint16_t maxsize, uint16_t timeout);
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// Properly process packets until you get to one you want
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uint16_t processPacketsUntil(uint8_t *buffer, uint8_t waitforpackettype, uint16_t timeout);
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// Shared state that subclasses can use:
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const char *servername;
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int16_t portnum;
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const char *clientid;
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const char *username;
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const char *password;
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const char *will_topic;
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const char *will_payload;
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uint8_t will_qos;
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uint8_t will_retain;
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uint8_t buffer[MAXBUFFERSIZE]; // one buffer, used for all incoming/outgoing
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uint16_t packet_id_counter;
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private:
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Adafruit_MQTT_Subscribe *subscriptions[MAXSUBSCRIPTIONS];
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void flushIncoming(uint16_t timeout);
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// Functions to generate MQTT packets.
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uint8_t connectPacket(uint8_t *packet);
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uint8_t disconnectPacket(uint8_t *packet);
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uint16_t publishPacket(uint8_t *packet, const char *topic, uint8_t *payload, uint16_t bLen, uint8_t qos);
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uint8_t subscribePacket(uint8_t *packet, const char *topic, uint8_t qos);
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uint8_t unsubscribePacket(uint8_t *packet, const char *topic);
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uint8_t pingPacket(uint8_t *packet);
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uint8_t pubackPacket(uint8_t *packet, uint16_t packetid);
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};
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class Adafruit_MQTT_Publish {
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public:
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Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const char *feed, uint8_t qos = 0);
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bool publish(const char *s);
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bool publish(double f, uint8_t precision=2); // Precision controls the minimum number of digits after decimal.
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// This might be ignored and a higher precision value sent.
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bool publish(int32_t i);
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bool publish(uint32_t i);
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bool publish(uint8_t *b, uint16_t bLen);
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private:
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Adafruit_MQTT *mqtt;
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const char *topic;
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uint8_t qos;
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};
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class Adafruit_MQTT_Subscribe {
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public:
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Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const char *feedname, uint8_t q=0);
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void setCallback(SubscribeCallbackUInt32Type callb);
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void setCallback(SubscribeCallbackDoubleType callb);
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void setCallback(SubscribeCallbackBufferType callb);
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void setCallback(AdafruitIO_MQTT *io, SubscribeCallbackIOType callb);
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void removeCallback(void);
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const char *topic;
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uint8_t qos;
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uint8_t lastread[SUBSCRIPTIONDATALEN];
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// Number valid bytes in lastread. Limited to SUBSCRIPTIONDATALEN-1 to
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// ensure nul terminating lastread.
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uint16_t datalen;
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SubscribeCallbackUInt32Type callback_uint32t;
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SubscribeCallbackDoubleType callback_double;
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SubscribeCallbackBufferType callback_buffer;
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SubscribeCallbackIOType callback_io;
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AdafruitIO_MQTT *io_mqtt;
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private:
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Adafruit_MQTT *mqtt;
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};
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#endif
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