Hello. I would like to make esphome sensor independent on Home Assistant in that it reads weather forecast from openweathermap and controls some switches (roolls up exterior blinds if wind is coming).
I can read forecast by http_request.get and it is in JSON, XML or HTTP format. Can I convert from these formats to variables in esphome, or do I need to do it in C++ lambda?
Thanks, Jan
Paste the response that you’re getting here and we’ll have a shot. Use the preformatted text button in the editor when posting code.
{"your code": "should end up looking like this"}
{“not”: “like this”}
Thanks. The response looks like this, forecast is in section “weather” and I am looking for value “list.wind.speed”:
{"cod":"200","message":0,"cnt":1,"list":[{"dt":1619805600,"main":{"temp":287.83,"feels_like":286.5,"temp_min":284.84,"temp_max":287.83,"pressure":1010,"sea_level":1010,"grnd_level":987,"humidity":44,"temp_kf":2.99},"weather":[{"id":801,"main":"Clouds","description":"few clouds","icon":"02d"}],"clouds":{"all":24},"wind":{"speed":4.43,"deg":18,"gust":8.14},"visibility":10000,"pop":0,"sys":{"pod":"d"},"dt_txt":"2021-04-30 18:00:00"}],"city":{"id":3067696,"name":"Prague","coord":{"lat":50.088,"lon":14.4208},"country":"CZ","population":1165581,"timezone":7200,"sunrise":1619753998,"sunset":1619806732}}
Solved it! Following code works. It finds third forecast of hourly wind speed, which is 1-2 hours ahead of current time:
(please note that I was getting some crashes on ESP8266, but not on ESP32. Seems to be memory problem)
sensor:
- platform: template
name: "Predicted wind"
id: predicted_wind
http_request:
useragent: esphome/device
timeout: 10s
time:
- platform: sntp
on_time:
- seconds: 0
minutes: /15
then:
- lambda: |-
HTTPClient http;
http.begin("http://api.openweathermap.org/data/2.5/onecall?lat=51&lon=14&appid=974---------------8c0d&lang=cz&exclude=minutely,daily,alerts");
http.GET();
DynamicJsonBuffer doc(31000); //cannot be smaller, response is big!
JsonObject& root = doc.parseObject(http.getStream());
float ws = atof(root["hourly"][2]["wind_speed"].as<char*>());
id(predicted_wind).publish_state(ws);
//ESP_LOGD("main", "############## %s", root["hourly"][2]["wind_speed"].as<char*>()); //.as<char*>());
Great job! These little devices really can do a lot, can’t they?
Is this code up to date with the last version? I’m getting an error
esphome.yaml:119:7: error: 'HTTPClient' was not declared in this scope
Do you have this declaration in yaml?
http_request:
useragent: esphome/device
timeout: 5s #30s
It’s not working for me, esp is restarting with the following error:
Guru Meditation Error: Core 1 panic’ed (LoadProhibited). Exception was unhandled
Do you use esp32? It did not work for me very well with esp8266.
I am using a esp32.
I’m trying to make a GET request from the following site:
http://ip-api.com/json/
I have a feeling it has to do with the buffer
That should not be a problem give me email and I will send you whole script that uses weather json
Thank you, I sent you a PM.
Where does the DynamicJsonBuffer come from? that’s definitely what’s cousing the trouble.
Hello,
I am interrested also in getting the public IP and displaying as a sensor value. The API I would like to use is https://wasab.is/ but the other mentioned here should work as well. Is it possible to get an example code snippet on how is this done?
Thank You!
Did the following:
http_request:
esp8266_disable_ssl_support: true
time:
...
- seconds: 0
minutes: /15
then:
- lambda: |-
HTTPClient http;
http.begin("http://wasab.is/json");
http.GET();
DynamicJsonBuffer doc(12000);
JsonObject& root = doc.parseObject(http.getStream());
float ip = atof(root["ip"].as<char*>());
id(public_ip_test).publish_state(ip);
sensor:
- platform: template
name: "Public IP"
id: public_ip_test
icon: mdi:wan
Unfortunately this does return only the first 4 characters from the IP address in the “sensor” value. I don’t have developer experienc so this is somewhat above my knowledge.
@eisengrau Not sure if you ended up getting it solved yourself but the below works.
Main changes is a “text_sensor” rathar than just a sensor and chagning the ip variable to a const char* rather than float. Note I am fairly new to C++ so there may be a more correct way
http_request:
esp8266_disable_ssl_support: true
time:
...
- seconds: 0
minutes: /15
then:
- lambda: |-
HTTPClient http;
http.begin("http://wasab.is/json");
http.GET();
DynamicJsonBuffer doc(12000);
JsonObject& root = doc.parseObject(http.getStream());
const char* ip = root["ip"].as<char*>();
id(public_ip_test).publish_state(ip);
text_sensor:
- platform: template
name: "Public IP"
id: public_ip_test
icon: mdi:wan
Hello janbenes
great job.
Can i use your support for extract “description” field in json array ?
Sorry but i am not expert in lambda language.
This is the json complete:
{"coord":{"lon":14,"lat":51},"weather":[{"id":800,"main":"Clear","description":"cielo sereno","icon":"01n"}],"base":"stations","main":{"temp":-0.75,"feels_like":-0.75,"temp_min":-2.12,"temp_max":0.64,"pressure":1022,"humidity":89},"visibility":10000,"wind":{"speed":0.45,"deg":337,"gust":0.89},"clouds":{"all":10},"dt":1646435168,"sys":{"type":2,"id":2008644,"country":"DE","sunrise":1646458837,"sunset":1646499047},"timezone":3600,"id":2867920,"name":"Mühlsdorf","cod":200}
Where can i find some documentation to study this function
Thanks a lot for your support
[SOLVED]
I used the HTTP Request docs on ESPHome.io as a basis and ended up with this (simpler) code:
http_request:
useragent: esphome/esp32dev
id: http_request_data
sensor:
- platform: template
name: "Air temperature"
id: air_temp
time:
- platform: sntp
id: sntp_time
on_time:
# Every 5 minutes
- seconds: 0
minutes: /5
then:
- http_request.get:
url: https://api.openweathermap.org/data/2.5/weather?q=oulu&appid=******************************************&units=metric
headers:
Content-Type: application/json
verify_ssl: false
on_response:
then:
- lambda: |-
json::parse_json(id(http_request_data).get_string(), [](JsonObject root) {
id(air_temp).publish_state(root["main"]["temp"]);
});
Every five minutes, it fetches my local weather info from OpenWeather and extracts the air temperature from the JSON object. It works to perfection.
Hello, sorry for the late reply. Unfortunately this did not work for me. I’m getting the following errors before complie:
/root/esphome/iot-esp8266-test.yaml:80:11: warning: unknown escape sequence: '\/'
80 | DynamicJsonBuffer doc(12000);
| ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/root/esphome/iot-esp8266-test.yaml:80:11: error: DynamicJsonBuffer is a class from ArduinoJson 5. Please see https://arduinojson.org/upgrade to learn how to upgrade your program to ArduinoJson version 6
Compiling .pioenvs/iot-esp8266-test/lib4d9/ESP8266WiFi/CertStoreBearSSL.cpp.o
/root/esphome/iot-esp8266-test.yaml: In lambda function:
/root/esphome/iot-esp8266-test.yaml:80:25: error: 'doc' was not declared in this scope
80 | DynamicJsonBuffer doc(12000);
| ^~~
This is with latest ESPhome 2022.5.1.
Disregard, my last comment. Managed to do it by @epollari 's example above 
My final config looks like:
# Time config & External IP
http_request:
esp8266_disable_ssl_support: true
useragent: esphome/esp32dev
id: http_request_test
time:
- platform: homeassistant
timezone: Europe/Amsterdam
on_time:
- seconds: 0
minutes: /30
then:
- http_request.get:
url: http://wasab.is/json
headers:
Content-Type: application/json
verify_ssl: false
on_response:
then:
- lambda: |-
json::parse_json(id(http_request_test).get_string(),[](JsonObject root){id(public_ip_test).publish_state(root["ip"]);});
text_sensor:
- platform: template
name: "Public IP"
id: public_ip_test
icon: mdi:wan
Thank you for your awesomeness!