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mqtt: begin subscription support

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This commit is contained in:
Kevin Hester 2021-04-05 08:42:52 +08:00
parent 55b8314a2a
commit 50a69d77e6
2 changed files with 49 additions and 19 deletions
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56
src/mqtt/MQTT.cpp
View File

@ -9,13 +9,29 @@
MQTT *mqtt;
String statusTopic = "mesh/stat/";
String cryptTopic = "mesh/crypt/"; // mesh/crypt/CHANNELID/NODEID
void mqttCallback(char *topic, byte *payload, unsigned int length)
void MQTT::mqttCallback(char *topic, byte *payload, unsigned int length)
{
DEBUG_MSG("MQTT topic %s\n", topic);
mqtt->onPublish(topic, payload, length);
}
// After parsing ServiceEnvelope
// FIXME - make sure to free both strings and the MeshPacket
void MQTT::onPublish(char *topic, byte *payload, unsigned int length)
{
// parsing ServiceEnvelope
ServiceEnvelope e = ServiceEnvelope_init_default;
if (!pb_decode_from_bytes(payload, length, ServiceEnvelope_fields, &e)) {
DEBUG_MSG("Invalid MQTT service envelope, topic %s, len %u!\n", topic, length);
} else {
DEBUG_MSG("Received MQTT topic %s, len=%u\n", topic, length);
// FIXME, ignore messages sent by us (requires decryption) or if we don't have the channel key
// make sure to free both strings and the MeshPacket (passing in NULL is acceptable)
free(e.channel_id);
free(e.gateway_id);
free(e.packet);
}
}
void mqttInit()
@ -53,15 +69,30 @@ void MQTT::reconnect()
static char subsStr[64]; /* We keep this static because the mqtt lib
might not be copying it */
// snprintf(subsStr, sizeof(subsStr), "/ezd/todev/%s/#", clientId);
// mqtt.subscribe(subsStr, 1); // we use qos 1 because we don't want to miss messages
// pubSub.subscribe(subsStr, 1); // we use qos 1 because we don't want to miss messages
/// FIXME, include more information in the status text
bool ok = pubSub.publish(myStatus.c_str(), "online", true);
DEBUG_MSG("published %d\n", ok);
sendSubscriptions();
} else
DEBUG_MSG("Failed to contact MQTT server...\n");
}
void MQTT::sendSubscriptions()
{
size_t numChan = channels.getNumChannels();
for (size_t i = 0; i < numChan; i++) {
auto &ch = channels.getByIndex(i);
if (ch.settings.uplink_enabled) {
String topic = cryptTopic + channels.getGlobalId(i) + "/#";
DEBUG_MSG("Subscribing to %s\n", topic.c_str());
pubSub.subscribe(topic.c_str(), 1); // FIXME, is QOS 1 right?
}
}
}
bool MQTT::wantsLink() const
{
bool hasChannel = false;
@ -124,18 +155,9 @@ void MQTT::onSend(const MeshPacket &mp, ChannelIndex chIndex)
static uint8_t bytes[MeshPacket_size + 64];
size_t numBytes = pb_encode_to_bytes(bytes, sizeof(bytes), ServiceEnvelope_fields, &env);
const char *topic = getCryptTopic(channelId);
DEBUG_MSG("publish %s, %u bytes\n", topic, numBytes);
String topic = cryptTopic + channelId + "/" + owner.id;
DEBUG_MSG("publish %s, %u bytes\n", topic.c_str(), numBytes);
pubSub.publish(topic, bytes, numBytes, false);
pubSub.publish(topic.c_str(), bytes, numBytes, false);
}
}
const char *MQTT::getCryptTopic(const char *channelId)
{
static char buf[128];
// "mesh/crypt/CHANNELID/NODEID/PORTID"
snprintf(buf, sizeof(buf), "mesh/crypt/%s/%s", channelId, owner.id);
return buf;
}

12
src/mqtt/MQTT.h
View File

@ -36,8 +36,6 @@ class MQTT : private concurrency::OSThread
virtual int32_t runOnce();
private:
const char *getCryptTopic(const char *channelId);
/** return true if we have a channel that wants uplink/downlink
*/
bool wantsLink() const;
@ -45,6 +43,16 @@ class MQTT : private concurrency::OSThread
/** Attempt to connect to server if necessary
*/
void reconnect();
/** Tell the server what subscriptions we want (based on channels.downlink_enabled)
*/
void sendSubscriptions();
/// Just C glue to call onPublish
static void mqttCallback(char *topic, byte *payload, unsigned int length);
/// Called when a new publish arrives from the MQTT server
void onPublish(char *topic, byte *payload, unsigned int length);
};
void mqttInit();