mathieu/Adafruit_MQTT_Library
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Use const pointers for payload

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The payload data is never modified by the library, so using const is
possible without any further changes. Using const allows using a string
literal, or String::c_str() as the payload.
This commit is contained in:
Matthijs Kooijman 2015-07-02 12:59:46 +02:00
parent d4e27c9b3f
commit 73f5be4e5c
2 changed files with 6 additions and 6 deletions
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6
Adafruit_MQTT.cpp
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@ -140,7 +140,7 @@ int8_t Adafruit_MQTT::connect() {
return 0;
}
bool Adafruit_MQTT::publish(const char *topic, char *data, uint8_t qos) {
bool Adafruit_MQTT::publish(const char *topic, const char *data, uint8_t qos) {
// Construct and send publish packet.
uint8_t len = publishPacket(buffer, topic, data, qos);
if (!sendPacket(buffer, len))
@ -294,7 +294,7 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
}
uint8_t Adafruit_MQTT::publishPacket(uint8_t *packet, const char *topic,
char *data, uint8_t qos) {
const char *data, uint8_t qos) {
uint8_t *p = packet;
uint16_t len;
@ -375,7 +375,7 @@ bool Adafruit_MQTT_Publish::publish(uint32_t i) {
return mqtt->publish(topic, payload, qos);
}
bool Adafruit_MQTT_Publish::publish(char *payload) {
bool Adafruit_MQTT_Publish::publish(const char *payload) {
return mqtt->publish(topic, payload, qos);
}

6
Adafruit_MQTT.h
View File

@ -116,7 +116,7 @@ class Adafruit_MQTT {
// Publish a message to a topic using the specified QoS level. Returns true
// if the message was published, false otherwise.
bool publish(const char *topic, char *payload, uint8_t qos);
bool publish(const char *topic, const char *payload, uint8_t qos);
// Add a subscription to receive messages for a topic. Returns true if the
// subscription could be added, false otherwise.
@ -161,7 +161,7 @@ class Adafruit_MQTT {
// Functions to generate MQTT packets.
uint8_t connectPacket(uint8_t *packet);
uint8_t publishPacket(uint8_t *packet, const char *topic, char *payload, uint8_t qos);
uint8_t publishPacket(uint8_t *packet, const char *topic, const char *payload, uint8_t qos);
uint8_t subscribePacket(uint8_t *packet, const char *topic, uint8_t qos);
uint8_t pingPacket(uint8_t *packet);
};
@ -171,7 +171,7 @@ class Adafruit_MQTT_Publish {
public:
Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const char *feed, uint8_t qos = 0);
bool publish(char *s);
bool publish(const char *s);
bool publish(double f, uint8_t precision=2); // Precision controls the minimum number of digits after decimal.
// This might be ignored and a higher precision value sent.
bool publish(int32_t i);