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Truncates payload if it doesn't fit in buffer #64

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Truncates payload if it doesn't fit in buffer #64

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8 changes: 8 additions & 0 deletions Adafruit_MQTT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -675,6 +675,14 @@ uint16_t Adafruit_MQTT::publishPacket(uint8_t *packet, const char *topic,
packet_id_counter++;
}

// Truncates payload if it doesn't fit in buffer
uint16_t used_buffer = p - packet;
uint16_t unused_buffer = MAXBUFFERSIZE - used_buffer;
if (bLen > unused_buffer) {
bLen = unused_buffer;
DEBUG_PRINTLN(F("Payload truncated to fit MAXBUFFERSIZE"));
}

memmove(p, data, bLen);
p+= bLen;
len = p - packet;
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