arduino/Adafruit_MQTT_Library
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Allow passing __FlashStringHelper* in addition to char* everywhere

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Arduino supplies the F() macro that allows easily putting strings in
PROGMEM and marking them with a custom type. Essentially,
a __FlashStringHelper* is just the same char*, but cast to a different
type, which allows for example Serial.print() to automatically handle
both PROGMEM and normal strings.

By letting this library accept __FlashStringHelper* as well, you can
use easily use the F() macro and reduce the chance of mixing up normal
and PROGMEM pointers.
This commit is contained in:
Matthijs Kooijman
2015-07-24 11:29:22 +02:00
parent 22b77ecb68
commit 5d101b8a7b
2 changed files with 37 additions and 0 deletions
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9
Adafruit_MQTT.h
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@ -94,6 +94,8 @@ class Adafruit_MQTT {
public:
Adafruit_MQTT(const char *server, uint16_t port, const char *cid,
const char *user, const char *pass);
Adafruit_MQTT(const __FlashStringHelper *server, uint16_t port, const __FlashStringHelper *cid,
const __FlashStringHelper *user, const __FlashStringHelper *pass);
virtual ~Adafruit_MQTT() {}
// Connect to the MQTT server. Returns 0 on success, otherwise an error code
@ -124,7 +126,12 @@ class Adafruit_MQTT {
// Publish a message to a topic using the specified QoS level. Returns true
// if the message was published, false otherwise.
// The topic must be stored in PROGMEM. It can either be a
// char*, or a __FlashStringHelper* (the result of the F() macro).
bool publish(const char *topic, const char *payload, uint8_t qos);
bool publish(const __FlashStringHelper *topic, const char *payload, uint8_t qos) {
return publish((const char *)topic, payload, qos);
}
// Add a subscription to receive messages for a topic. Returns true if the
// subscription could be added or was already present, false otherwise.
@ -180,6 +187,7 @@ class Adafruit_MQTT {
class Adafruit_MQTT_Publish {
public:
Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const char *feed, uint8_t qos = 0);
Adafruit_MQTT_Publish(Adafruit_MQTT *mqttserver, const __FlashStringHelper *feed, uint8_t qos = 0);
bool publish(const char *s);
bool publish(double f, uint8_t precision=2); // Precision controls the minimum number of digits after decimal.
@ -196,6 +204,7 @@ private:
class Adafruit_MQTT_Subscribe {
public:
Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const char *feedname, uint8_t q=0);
Adafruit_MQTT_Subscribe(Adafruit_MQTT *mqttserver, const __FlashStringHelper *feedname, uint8_t q=0);
bool setCallback(void (*callback)(char *));