Add espmqtt library + bindings
This commit is contained in:
Andrew Gough
parent
bded035406
commit
4207d6c8ad
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@ -8,3 +8,6 @@
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[submodule "components/u8g2/u8g2"]
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path = components/u8g2/u8g2
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url = https://github.com/olikraus/U8g2_Arduino.git
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[submodule "components/espmqtt"]
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path = components/espmqtt
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url = https://github.com/tuanpmt/espmqtt
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@ -0,0 +1 @@
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Subproject commit 2967332b95454d4b53068a0d5484ae60e312eb12
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@ -180,4 +180,10 @@ config LUA_MODULE_WS2812
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help
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Includes the ws2812 module.
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config LUA_MODULE_MQTT
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bool "MQTT module"
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default "n"
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help
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Includes the MQTT module.
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endmenu
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@ -0,0 +1,626 @@
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// Module for interfacing with an MQTT broker
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#include "module.h"
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#include "lauxlib.h"
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#include "platform.h"
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#include "task/task.h"
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#include "mqtt.h"
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#include <string.h>
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task_handle_t hConn;
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task_handle_t hOff;
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task_handle_t hPub;
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task_handle_t hSub;
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task_handle_t hData;
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//used as a holder to copy received data from the MQTT task
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//to the main Lua task. Due to the async nature of the tasks
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//we must copy the data to deliver it intact to the Lua
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//callback
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typedef struct lmqtt_ctx
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{
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mqtt_client * client;
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char topic[CONFIG_MQTT_MAX_LWT_TOPIC];
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char * data;
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} lmqtt_ctx_t;
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// locate the C mqtt_client pointer and leave the
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// Lua instance on the top of the stack
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static mqtt_client * get_client( lua_State * L )
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{
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if( !lua_istable( L, 1 ) )
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{
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luaL_error( L, "Expected MQTT module (client)" );
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return 0; //never reached
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}
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lua_getfield( L, 1, "_client" );
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if( !lua_islightuserdata( L, -1 ) )
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{
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luaL_error( L, "Expected MQTT client pointer" );
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return 0; //never reached
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}
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mqtt_client * client = (mqtt_client *) lua_touserdata( L, -1 );
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lua_pop( L, 1 ); // just pop the _mqtt field
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return client;
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}
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// locate the C mqtt_settings pointer and leave the
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// Lua instance on the top of the stack
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static mqtt_settings * get_settings( lua_State * L )
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{
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if( !lua_istable( L, 1 ) )
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{
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luaL_error( L, "Expected MQTT module (settings)" );
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return 0; //never reached
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}
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lua_getfield( L, 1, "_settings" );
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if( !lua_islightuserdata( L, -1 ) )
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{
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luaL_error( L, "Expected MQTT settings pointer" );
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return 0; //never reached
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}
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mqtt_settings * settings = (mqtt_settings *) lua_touserdata( L, -1 );
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lua_pop( L, 1 ); // just pop the _mqtt field
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return settings;
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}
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// Lua: on()
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static int lmqtt_on(lua_State *L)
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{
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enum events{
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ON_CONNECT = 0,
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ON_MESSAGE = 1,
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ON_OFFLINE = 2
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};
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const char *const eventnames[] = {"connect", "message", "offline", NULL};
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// mqtt_settings * settings = get_settings( L );
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int event = luaL_checkoption(L, 2, "message", eventnames);
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if( !lua_isfunction( L, 3 ) )
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return 0;
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switch (event) {
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case ON_CONNECT:
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lua_setfield(L, 1, "_on_connect");
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break;
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case ON_MESSAGE:
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lua_setfield(L, 1, "_on_message");
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break;
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case ON_OFFLINE:
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lua_setfield(L, 1, "_on_offline");
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break;
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default:
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return 0;
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}
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lua_pop(L, 1); //pop event name
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return 0;
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}
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//typedef void (*task_callback_t)(task_param_t param, task_prio_t prio);
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static void lmqtt_connected_cb(task_param_t param, task_prio_t prio)
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{
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lua_State * L = lua_getstate(); //returns main Lua state
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if( L == NULL )
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return;
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mqtt_client * client = (mqtt_client *) param;
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int top = lua_gettop(L);
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lua_checkstack(L, 8);
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char key[64];
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snprintf(key, 64, "mqtt_%p", client->settings);
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lua_getglobal( L, key ); //retrieve MQTT table from _G
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NODE_DBG("CB:connect: state %p, settings %p, stack top %d\n", L, client->settings, lua_gettop(L));
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lua_getfield( L, -1, "_connect_ok" );
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if( lua_isfunction( L, -1 ) )
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{
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int top1 = lua_gettop(L);
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NODE_DBG("CB:connect: calling registered one-shot connect callback\n");
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lua_pushvalue( L, -2 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the connect callback
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if( res != 0 )
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NODE_DBG("CB:connect: Error when calling one-shot connect callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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//after connecting ok, we clear _both_ the one-shot callbacks
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lua_pushnil(L);
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lua_setfield(L, 1, "_connect_ok");
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lua_pushnil(L);
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lua_setfield(L, 1, "_connect_nok");
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lua_settop(L, top1);
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}
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// now we check for the standard connect callback registered with 'mqtt:on()'
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lua_getfield( L, 1, "_on_connect" );
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if( lua_isfunction( L, -1 ) )
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{
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NODE_DBG("CB:connect: calling registered standard connect callback\n");
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lua_pushvalue( L, 1 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the connect callback
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if( res != 0 )
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NODE_DBG("CB:connect: Error when calling connect callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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}
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lua_settop(L, top);
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}
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static void connected_cb( mqtt_client *client, mqtt_event_data_t *event_data )
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{
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task_post_medium(hConn, (task_param_t) client);
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}
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static void lmqtt_disconnected_cb(task_param_t param, task_prio_t prio)
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{
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lua_State * L = lua_getstate(); //returns main Lua state
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if( L == NULL )
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return;
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mqtt_client * client = (mqtt_client *) param;
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int top = lua_gettop(L);
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lua_checkstack(L, 8);
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char key[64];
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snprintf(key, 64, "mqtt_%p", client->settings);
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lua_getglobal( L, key ); //retrieve MQTT table from _G
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NODE_DBG("CB:disconnect: state %p, settings %p, stack top %d\n", L, client->settings, lua_gettop(L));
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lua_getfield( L, -1, "_connect_nok" );
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if( lua_isfunction( L, -1 ) )
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{
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NODE_DBG("CB:disconnect: calling registered one-shot disconnect callback\n");
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lua_pushvalue( L, -2 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the disconnect callback
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if( res != 0 )
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NODE_DBG("CB:disconnect: Error when calling one-shot disconnect callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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//after connecting ok, we clear _both_ the one-shot callbacks
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lua_pushnil(L);
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lua_setfield(L, 1, "_connect_ok");
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lua_pushnil(L);
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lua_setfield(L, 1, "_connect_nok");
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}
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// now we check for the standard connect callback registered with 'mqtt:on()'
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lua_getfield( L, -1, "_on_offline" );
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if( !lua_isfunction( L, -1 ) || lua_isnil( L, -1 ) )
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return;
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NODE_DBG("CB:disconnect: calling registered standard offline callback\n");
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lua_pushvalue( L, -2 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the offline callback
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if( res != 0 )
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NODE_DBG("CB:disconnect: Error when calling offline callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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lua_settop(L, top);
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}
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static void disconnected_cb( mqtt_client *client, mqtt_event_data_t *event_data )
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{
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task_post_medium( hOff, (task_param_t) client);
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}
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static void lmqtt_subscribe_cb(task_param_t param, task_prio_t prio)
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{
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lua_State * L = lua_getstate(); //returns main Lua state
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if( L == NULL )
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return;
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mqtt_client * client = (mqtt_client *) param;
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int top = lua_gettop(L);
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lua_checkstack(L, 8);
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char key[64];
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snprintf(key, 64, "mqtt_%p", client->settings);
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lua_getglobal( L, key ); //retrieve MQTT table from _G
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NODE_DBG("CB:subscribe: state %p, settings %p, stack top %d\n", L, client->settings, lua_gettop(L));
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lua_getfield( L, 1, "_subscribe_ok" );
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if( lua_isfunction( L, -1 ) )
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{
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NODE_DBG("CB:subscribe: calling registered one-shot subscribe callback\n");
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lua_pushvalue( L, 1 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the disconnect callback
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if( res != 0 )
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NODE_DBG("CB:subscribe: Error when calling one-shot subscribe callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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lua_pushnil(L);
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lua_setfield(L, 1, "_subscribe_ok");
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}
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lua_settop(L, top);
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}
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static void subscribe_cb( mqtt_client *client, mqtt_event_data_t *event_data )
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{
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task_post_medium(hSub, (task_param_t) client);
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}
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static void lmqtt_publish_cb(task_param_t param, task_prio_t prio)
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{
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NODE_DBG("CB:publish: successfully transferred control back to main task\n");
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lua_State * L = lua_getstate(); //returns main Lua state
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if( L == NULL )
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return;
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mqtt_client * client = (mqtt_client *) param;
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int top = lua_gettop(L);
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lua_checkstack(L, 8);
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char key[64];
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snprintf(key, 64, "mqtt_%p", client->settings);
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lua_getglobal( L, key ); //retrieve MQTT table from _G
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NODE_DBG("CB:publish: state %p, settings %p, stack top %d\n", L, client->settings, lua_gettop(L));
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lua_getfield( L, 1, "_publish_ok" );
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if( lua_isfunction( L, -1 ) )
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{
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NODE_DBG("CB:publish: calling registered one-shot publish callback\n");
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lua_pushvalue( L, 1 ); //dup mqtt table
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int res = lua_pcall( L, 1, 0, 0 ); //call the disconnect callback
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if( res != 0 )
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NODE_DBG("CB:publish: Error when calling one-shot publish callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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lua_pushnil(L);
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lua_setfield(L, 1, "_publish_ok");
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}
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lua_settop(L, top);
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}
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static void publish_cb( mqtt_client *client, mqtt_event_data_t *event_data )
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{
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NODE_DBG("CB:publish: transferring control back to main task\n");
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task_post_medium(hPub, (task_param_t) client);
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}
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static void lmqtt_data_cb(task_param_t param, task_prio_t prio)
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{
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lua_State * L = lua_getstate(); //returns main Lua state
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if( L == NULL )
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return;
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lmqtt_ctx_t * ctx = (lmqtt_ctx_t *) param;
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int top = lua_gettop(L);
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lua_checkstack(L, 8);
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char key[64];
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snprintf(key, 64, "mqtt_%p", ctx->client->settings);
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lua_getglobal( L, key ); //retrieve MQTT table from _G
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NODE_DBG("CB:data: state %p, settings %p, stack top %d\n", L, ctx->client->settings, lua_gettop(L));
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lua_getfield( L, 1, "_on_message" );
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if( lua_isfunction( L, -1 ) )
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{
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int numArg = 2;
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lua_pushvalue( L, 1 ); //dup mqtt table
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lua_pushstring( L, ctx->topic );
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if( ctx->data != NULL )
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{
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lua_pushstring( L, ctx->data );
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numArg++;
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}
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int res = lua_pcall( L, numArg, 0, 0 ); //call the messagecallback
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if( res != 0 )
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NODE_DBG("CB:data: Error when calling message callback - (%d) %s\n", res, luaL_checkstring( L, -1 ) );
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}
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lua_settop(L, top);
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if( ctx->data != NULL )
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free( ctx->data );
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}
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static void data_cb( mqtt_client *client, mqtt_event_data_t *event_data )
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{
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NODE_DBG("CB:data: topic len %d, data len %d\n", event_data->topic_length, event_data->data_length);
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lmqtt_ctx_t * ctx = malloc(sizeof(lmqtt_ctx_t));
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ctx->client = client;
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strncpy(ctx->topic, event_data->topic, event_data->topic_length);
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ctx->topic[event_data->topic_length] = '\0';
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ctx->data = NULL;
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if( event_data->data_length > 0 )
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{
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ctx->data = malloc( event_data->data_length );
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strncpy( ctx->data, event_data->data, event_data->data_length );
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ctx->data[event_data->data_length] = '\0';
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}
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task_post_medium(hData, (task_param_t) ctx);
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}
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// Lua: mqtt:connect(host[, port[, secure[, autoreconnect]]][, function(client)[, function(client, reason)]])
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static int lmqtt_connect( lua_State* L )
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{
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mqtt_settings * settings = get_settings( L );
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// int secure = 0;
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int reconnect = 0;
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const char * host = luaL_checkstring( L, 2 );
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int port = 1883;
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int n = 3;
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if( lua_isnumber( L, n ) )
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{
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port = luaL_checknumber( L, n );
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n++;
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}
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if( lua_isnumber( L, n ) )
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{
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// secure = !!luaL_checkinteger( L, -4 );
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n++;
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}
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if( lua_isnumber( L, n ) )
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{
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reconnect = !!luaL_checkinteger( L, n );
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n++;
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}
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if( lua_isfunction( L, n ) )
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{
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lua_pushvalue( L, n );
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lua_setfield( L, 1, "_connect_ok" ); // set _G["_cb_connect_ok"] = fn()
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n++;
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}
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if( lua_isfunction( L, n ) )
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{
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lua_pushvalue( L, n );
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lua_setfield(L, 1, "_connect_nok"); // set _G["_cb_connect_nok"] = fn()
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n++;
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}
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lua_pop( L, n - 2 ); //pop parameters
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strncpy(settings->host, host, CONFIG_MQTT_MAX_HOST_LEN );
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settings->port = port;
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settings->auto_reconnect = reconnect != 0;
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settings->connected_cb = connected_cb;
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settings->disconnected_cb = disconnected_cb;
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settings->subscribe_cb = subscribe_cb;
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settings->publish_cb = publish_cb;
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settings->data_cb = data_cb;
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mqtt_client * client = mqtt_start( settings );
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if( client == NULL )
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{
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luaL_error( L, "MQTT library failed to start" );
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return 0;
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}
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NODE_DBG("Created MQTT client @ %p, settings @ %p, state @ %p, top %d \n", client, settings, L, lua_gettop( L ) );
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lua_pushlightuserdata( L, client );
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lua_setfield( L, -2, "_client" ); //and store a reference in the MQTT table
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return 0;
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}
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// Lua: mqtt:close()
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static int lmqtt_close( lua_State* L )
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{
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mqtt_client * client = get_client( L );
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if( client == NULL )
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return 0;
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NODE_DBG("Closing MQTT client %p\n", client);
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char id[64];
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snprintf(id, 64, "mqtt_%p", client->settings);
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lua_pushnil( L );
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lua_setglobal( L, id ); // remove global reference
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lua_pushstring( L, "_client" );
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lua_pushnil( L );
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lua_settable( L, -3 ); //and remove a reference in the MQTT table
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return 0;
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}
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|
||||
// Lua: mqtt:lwt(topic, message[, qos[, retain]])
|
||||
static int lmqtt_lwt( lua_State* L )
|
||||
{
|
||||
mqtt_settings * settings = get_settings( L );
|
||||
|
||||
strncpy( settings->lwt_topic, luaL_checkstring( L, 2 ), CONFIG_MQTT_MAX_LWT_TOPIC );
|
||||
strncpy( settings->lwt_msg, luaL_checkstring( L, 3 ), CONFIG_MQTT_MAX_LWT_MSG );
|
||||
settings->lwt_msg_len = strlen( settings->lwt_msg );
|
||||
|
||||
int n = 4;
|
||||
if( lua_isnumber( L, n ) )
|
||||
{
|
||||
settings->lwt_qos = lua_tonumber( L, n );
|
||||
n++;
|
||||
}
|
||||
|
||||
if( lua_isnumber( L, n ) )
|
||||
{
|
||||
settings->lwt_retain = lua_tonumber( L, n );
|
||||
n++;
|
||||
}
|
||||
|
||||
lua_pop( L, n );
|
||||
NODE_DBG("Set LWT topic '%s', qos %d, retain %d, len %d\n", settings->lwt_topic, settings->lwt_qos, settings->lwt_retain, settings->lwt_msg_len);
|
||||
return 0;
|
||||
}
|
||||
|
||||
//Lua: mqtt:publish(topic, payload, qos, retain[, function(client)])
|
||||
static int lmqtt_publish( lua_State * L )
|
||||
{
|
||||
mqtt_client * client = get_client( L );
|
||||
|
||||
int top = lua_gettop(L);
|
||||
|
||||
const char * topic = luaL_checkstring( L, 2 );
|
||||
const char * data = luaL_checkstring( L, 3 );
|
||||
int qos = luaL_checkint( L, 4 );
|
||||
int retain = luaL_checkint( L, 5 );
|
||||
|
||||
int n = 6;
|
||||
if( lua_isfunction( L, n ) )
|
||||
{
|
||||
lua_pushvalue( L, n );
|
||||
lua_setfield(L, 1, "_publish_ok"); // set _G["_cb_connect_nok"] = fn()
|
||||
n++;
|
||||
}
|
||||
|
||||
lua_settop(L, top );
|
||||
NODE_DBG("MQTT publish client id %s, topic %s, %d bytes\n", client->settings->client_id, topic, strlen(data));
|
||||
mqtt_publish(client, topic, data, strlen(data), qos, retain);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Lua: mqtt:subscribe(topic, qos[, function(client)]) OR mqtt:subscribe(table[, function(client)])
|
||||
static int lmqtt_subscribe( lua_State* L )
|
||||
{
|
||||
mqtt_client * client = get_client( L );
|
||||
|
||||
int top = lua_gettop(L);
|
||||
|
||||
const char * topic = luaL_checkstring( L, 2 );
|
||||
int qos = luaL_checkint( L, 3 );
|
||||
|
||||
if( lua_isfunction( L, 4 ) )
|
||||
{
|
||||
lua_pushvalue( L, 4 );
|
||||
lua_setfield(L, 1, "_subscribe_ok"); // set _G["_cb_connect_nok"] = fn()
|
||||
}
|
||||
|
||||
lua_settop(L, top );
|
||||
NODE_DBG("MQTT subscribe client id %s, topic %s\n", client->settings->client_id, topic);
|
||||
mqtt_subscribe(client, topic, qos);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Lua: mqtt:unsubscribe(topic[, function(client)]) OR mqtt:unsubscribe(table[, function(client)])
|
||||
static int lmqtt_unsubscribe( lua_State* L )
|
||||
{
|
||||
// mqtt_client * client = get_client( L );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lmqtt_delete( lua_State* L )
|
||||
{
|
||||
mqtt_settings * settings = get_settings( L );
|
||||
if( settings != NULL )
|
||||
free( settings );
|
||||
|
||||
mqtt_client * client = get_client( L );
|
||||
if( client != NULL )
|
||||
{
|
||||
NODE_DBG("stopping MQTT client id %s\n", client->settings->client_id);
|
||||
mqtt_destroy( client );
|
||||
free( client );
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Lua: mqtt.Client(clientid, keepalive[, username, password, cleansession])
|
||||
static int lmqtt_new( lua_State* L )
|
||||
{
|
||||
const char * clientid = NULL;
|
||||
|
||||
clientid = luaL_checkstring( L, 1 );
|
||||
NODE_DBG("MQTT client id %s\n", clientid);
|
||||
|
||||
mqtt_settings * settings = (mqtt_settings *) malloc( sizeof(mqtt_settings) );
|
||||
memset(settings, 0, sizeof(mqtt_settings) );
|
||||
|
||||
strncpy(settings->client_id, clientid, CONFIG_MQTT_MAX_CLIENT_LEN);
|
||||
settings->keepalive = luaL_checkinteger( L, 2 );
|
||||
|
||||
int n = 2;
|
||||
if( lua_isstring(L, 3) )
|
||||
{
|
||||
strncpy( settings->username, luaL_checkstring( L, 3 ), CONFIG_MQTT_MAX_USERNAME_LEN);
|
||||
n++;
|
||||
}
|
||||
|
||||
if( lua_isstring(L, 4) )
|
||||
{
|
||||
strncpy(settings->password, luaL_checkstring( L, 4 ), CONFIG_MQTT_MAX_PASSWORD_LEN);
|
||||
n++;
|
||||
}
|
||||
|
||||
if( lua_isnumber(L, 5) )
|
||||
{
|
||||
settings->clean_session = luaL_checknumber( L, 5 );
|
||||
n++;
|
||||
}
|
||||
lua_pop( L, n ); //remove parameters
|
||||
|
||||
lua_newtable( L );
|
||||
NODE_DBG("New MQTT table at stack pos %d\n", lua_gettop(L));
|
||||
|
||||
lua_pushlightuserdata( L, settings );
|
||||
lua_setfield( L, -2, "_settings" ); // set t["_mqtt"] = client
|
||||
|
||||
lua_pushcfunction( L, lmqtt_connect );
|
||||
lua_setfield( L, -2, "connect" ); // set t["connect"] = lmqtt_connect
|
||||
|
||||
lua_pushcfunction( L, lmqtt_close );
|
||||
lua_setfield( L, -2, "close" ); // set t["close"] = lmqtt_close
|
||||
|
||||
lua_pushcfunction( L, lmqtt_lwt );
|
||||
lua_setfield( L, -2, "lwt" ); // set t["lwt"] = lmqtt_lwt
|
||||
|
||||
lua_pushcfunction( L, lmqtt_publish );
|
||||
lua_setfield( L, -2, "publish" ); // set t["publish"] = lmqtt_publish
|
||||
|
||||
lua_pushcfunction( L, lmqtt_subscribe );
|
||||
lua_setfield( L, -2, "subscribe" ); // set t["subscribe"] = lmqtt_subscribe
|
||||
|
||||
lua_pushcfunction( L, lmqtt_unsubscribe );
|
||||
lua_setfield( L, -2, "unsubscribe" ); // set t["unsubscribe"] = lmqtt_unsubscribe
|
||||
|
||||
lua_pushcfunction( L, lmqtt_on );
|
||||
lua_setfield( L, -2, "on" ); // set t["on"] = lmqtt_on
|
||||
|
||||
lua_pushcfunction( L, lmqtt_delete );
|
||||
lua_setfield( L, -2, "__gc" ); // set t["__gc"] = lmqtt_delete
|
||||
|
||||
lua_pushvalue( L, 1 ); //make a copy of the table
|
||||
lua_setmetatable( L, -2 );
|
||||
|
||||
char id[32];
|
||||
snprintf( id, 32, "mqtt_%p", settings );
|
||||
NODE_DBG("Store MQTT table in _G stack pos %d\n", lua_gettop(L));
|
||||
lua_pushvalue( L, 1 ); //make a copy of the table
|
||||
lua_setglobal( L, id);
|
||||
|
||||
hConn = task_get_id(lmqtt_connected_cb);
|
||||
hOff = task_get_id(lmqtt_disconnected_cb);
|
||||
hPub = task_get_id(lmqtt_publish_cb);
|
||||
hSub = task_get_id(lmqtt_subscribe_cb);
|
||||
hData = task_get_id(lmqtt_data_cb);
|
||||
|
||||
NODE_DBG("conn %d, off %d, pub %d, sub %d, data %d\n", hConn, hOff, hPub, hSub, hData);
|
||||
return 1; //leave table on top of the stack
|
||||
}
|
||||
|
||||
|
||||
// Module function map
|
||||
static const LUA_REG_TYPE mqtt_map[] = {
|
||||
{ LSTRKEY( "Client" ), LFUNCVAL( lmqtt_new ) },
|
||||
{ LNILKEY, LNILVAL }
|
||||
};
|
||||
|
||||
NODEMCU_MODULE(MQTT, "mqtt", mqtt_map, NULL);
|
||||
Loading…
Reference in New Issue