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Add MQTT retain to some JSON messages.

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This commit is contained in:
Jonathan Naylor 2026-03-23 17:51:28 +00:00
parent f320e82be4
commit 0e04ebae0f
5 changed files with 19 additions and 21 deletions
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9
Log.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2015,2016,2020,2022,2023,2025 by Jonathan Naylor G4KLX
* Copyright (C) 2015,2016,2020,2022,2023,2025,2026 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -102,17 +102,16 @@ void WriteJSONStatus(const std::string& status)
json["timestamp"] = CUtils::createTimestamp();
json["message"] = status;
WriteJSON("status", json);
WriteJSON("status", json, false);
}
void WriteJSON(const std::string& topLevel, nlohmann::json& json)
void WriteJSON(const std::string& topLevel, nlohmann::json& json, bool retain)
{
if (m_mqtt != nullptr) {
nlohmann::json top;
top[topLevel] = json;
m_mqtt->publish("json", top.dump());
m_mqtt->publish("json", top.dump(), retain);
}
}

4
Log.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2015,2016,2020,2022,2023 by Jonathan Naylor G4KLX
* Copyright (C) 2015,2016,2020,2022,2023,2026 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -36,6 +36,6 @@ extern void LogInitialise(unsigned int displayLevel, unsigned int mqttLevel);
extern void LogFinalise();
extern void WriteJSONStatus(const std::string& status);
extern void WriteJSON(const std::string& topLevel, nlohmann::json& json);
extern void WriteJSON(const std::string& topLevel, nlohmann::json& json, bool retain);
#endif

16
MQTTConnection.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2022,2023,2025 by Jonathan Naylor G4KLX
* Copyright (C) 2022,2023,2025,2026 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -99,22 +99,22 @@ bool CMQTTConnection::open()
return true;
}
bool CMQTTConnection::publish(const char* topic, const char* text)
bool CMQTTConnection::publish(const char* topic, const char* text, bool retain)
{
assert(topic != nullptr);
assert(text != nullptr);
return publish(topic, (unsigned char*)text, (unsigned int)::strlen(text));
return publish(topic, (unsigned char*)text, (unsigned int)::strlen(text), retain);
}
bool CMQTTConnection::publish(const char* topic, const std::string& text)
bool CMQTTConnection::publish(const char* topic, const std::string& text, bool retain)
{
assert(topic != nullptr);
return publish(topic, (unsigned char*)text.c_str(), (unsigned int)text.size());
return publish(topic, (unsigned char*)text.c_str(), (unsigned int)text.size(), retain);
}
bool CMQTTConnection::publish(const char* topic, const unsigned char* data, unsigned int len)
bool CMQTTConnection::publish(const char* topic, const unsigned char* data, unsigned int len, bool retain)
{
assert(topic != nullptr);
assert(data != nullptr);
@ -126,13 +126,13 @@ bool CMQTTConnection::publish(const char* topic, const unsigned char* data, unsi
char topicEx[100U];
::sprintf(topicEx, "%s/%s", m_name.c_str(), topic);
int rc = ::mosquitto_publish(m_mosq, nullptr, topicEx, len, data, static_cast<int>(m_qos), false);
int rc = ::mosquitto_publish(m_mosq, nullptr, topicEx, len, data, static_cast<int>(m_qos), retain);
if (rc != MOSQ_ERR_SUCCESS) {
::fprintf(stderr, "MQTT Error publishing: %s\n", ::mosquitto_strerror(rc));
return false;
}
} else {
int rc = ::mosquitto_publish(m_mosq, nullptr, topic, len, data, static_cast<int>(m_qos), false);
int rc = ::mosquitto_publish(m_mosq, nullptr, topic, len, data, static_cast<int>(m_qos), retain);
if (rc != MOSQ_ERR_SUCCESS) {
::fprintf(stderr, "MQTT Error publishing: %s\n", ::mosquitto_strerror(rc));
return false;

9
MQTTConnection.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (C) 2022,2023,2025 by Jonathan Naylor G4KLX
* Copyright (C) 2022,2023,2025,2026 by Jonathan Naylor G4KLX
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -37,9 +37,9 @@ public:
bool open();
bool publish(const char* topic, const char* text);
bool publish(const char* topic, const std::string& text);
bool publish(const char* topic, const unsigned char* data, unsigned int len);
bool publish(const char* topic, const char* text, bool retain = false);
bool publish(const char* topic, const std::string& text, bool retain = false);
bool publish(const char* topic, const unsigned char* data, unsigned int len, bool retain = false);
void close();
@ -63,4 +63,3 @@ private:
};
#endif

2
Version.h
View file

@ -19,6 +19,6 @@
#if !defined(VERSION_H)
#define VERSION_H
const char* VERSION = "20260214";
const char* VERSION = "20260323";
#endif