Can I add several different functions to one EspHome module? For example, ESP32 with a bluetooth proxy + some other sensors or devices. Or temperature sensors and humidity sensors to same module?
Yes you can. Go nuts
Yes, but bt proxy is pretty resource intensive, so there are some limits.
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Does it depend how many bt devices bt proxy handles or is it resource hungry by itself?
All by itself. That being said, I have quite a few setup and every one of mine is working in addition to the ESP’s primary purpose. There’s only a handful of situations where I haven’t been able to add it as part of another project.
As long as you can serially flash the device, the worst that happens is it compiles, flashes and then crashes/won’t boot up, in which case you remove it, re-compile and flash serially.
Read through the documentation. It will warn you of memory hungry components.
Reason I actually asked this question is that I have device and BT proxy in different esp chips and they work happily as they are. When I try to put them together bcs it seems pointless to me run BT proxy as standalone, I start getting errors by compiling like src/esphome/components/fourheat/common.h:8:37: note: 'std::optional' is only available from C++17 onwards src/esphome/components/fourheat/common.h:8:37: error: 'optional' is not a member of 'std'
there seems to be problem that cant be solved.
Posting your full YAML would be a first step. Also, have you done ‘clean build files’? That fixes a lot of random errors when compiling.
I think the problem is that I tried to merry BT proxy with external component. As I understand from error there is some unresolvable conflict btw C++ versions.
substitutions:
name: bt-proxy-moretti
friendly_name: Moretti
tx_pin: GPIO01
rx_pin: GPIO03
esphome:
name: ${name}
friendly_name: ${friendly_name}
name_add_mac_suffix: false
project:
name: esphome.web
version: '1.0'
esp32:
board: esp32dev
api:
encryption:
key:
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
ota:
- platform: esphome
id: ota_esphome
esp32_ble_tracker:
scan_parameters:
active: true
bluetooth_proxy:
active: true
external_components:
source: github://leoshusar/4heat-esphome
uart:
tx_pin: ${tx_pin}
rx_pin: ${rx_pin}
baud_rate: 9600
fourheat:
switch:
- id: state_switch
name: State
platform: fourheat
restore_mode: DISABLED
datapoint: J30001
on_datapoint: J30253
off_datapoint: J30254
on_data: '1'
off_data: '1'
parser: |-
auto size = data.size();
return
data[size - 1] != '0' ||
data[size - 2] != '0';
- platform: fourheat
id: charging_motor_off
datapoint: B20698
on_data: '1'
off_data: '0'
parser: return data[data.size() - 1] != '0';
- platform: fourheat
id: Cleaning_Motor_Off
datapoint: B20701
on_data: '1'
off_data: '0'
parser: return data[data.size() - 1] != '0';
- platform: fourheat
id: Cleaning_Motor_2_Off
datapoint: B20700
on_data: '1'
off_data: '0'
parser: return data[data.size() - 1] != '0';
- platform: template
name: Enable night mode menu
lambda: |-
if (id(charging_motor_off).state) {
return true; // if night mode enabled, switch indicates ON
} else {
return false; // else OFF
}
turn_on_action:
- switch.turn_on: charging_motor_off
- switch.turn_on: Cleaning_Motor_Off
- switch.turn_on: Cleaning_Motor_2_Off
- select.set:
id: power
option: "P3"
turn_off_action:
- switch.turn_off: charging_motor_off
- switch.turn_off: Cleaning_Motor_Off
- switch.turn_off: Cleaning_Motor_2_Off
- select.set:
id: power
option: "Auto"
text_sensor:
- id: state
name: State
platform: fourheat
datapoint: J30001
options:
0: "OFF"
1: "Check Up"
2: "Ignition"
3: "Stabilization"
4: "Ignition"
5: "Run"
6: "Modulation"
7: "Extinguishing"
8: "Safety"
9: "Block"
10: "Recover Ignition"
11: "Standby"
30: "Ignition"
31: "Ignition"
32: "Ignition"
33: "Ignition"
34: "Ignition"
- id: error
name: Error
platform: fourheat
datapoint: J30002
options:
0: "No"
1: "Safety Thermostat HV1: signalled also in case of Stove OFF"
2: "Safety PressureSwitch HV2: signalled with Combustion Fan ON"
3: "Extinguishing for Exhausting Temperature lowering"
4: "Extinguishing for water over Temperature"
5: "Extinguishing for Exhausting over Temperature"
6: "unknown"
7: "Encoder Error: No Encoder Signal (in case of P25=1 or 2)"
8: "Encoder Error: Combustion Fan regulation failed (in case of P25=1 or 2)"
9: "Low pressure in to the Boiler"
10: "High pressure in to the Boiler Error"
11: "DAY and TIME not correct due to prolonged absence of Power Supply"
12: "Failed Ignition"
13: "Ignition"
14: "Ignition"
15: "Lack of Voltage Supply"
16: "Ignition"
17: "Ignition"
18: "Lack of Voltage Supply"
- id: combustion_power
name: Combustion power
platform: fourheat
datapoint: J30011
icon: "mdi:heating-coil"
options:
1: "P1"
2: "P2"
3: "P3"
4: "P4"
5: "P5"
6: "Cleaning"
7: "Standby"
8: "Ignition 2"
9: "Modulation"
10: "Ignition P0"
11: "MAX P"
12: "Extinguish"
100: "Off"
110: "Off"
120: "Pmax Test"
255: "Ignition"
0: "Stabilizing"
button:
- id: clear_error
name: Clear error
platform: fourheat
datapoint: J30255
select:
- id: power
name: Power
platform: fourheat
datapoint: B20364
options:
1: "P1"
2: "P2"
3: "P3"
4: "P4"
5: "P5"
6: "Auto"
binary_sensor:
- id: stove_offline
name: Stove offline
platform: fourheat
type: module_offline
- id: room_thermostat_state
name: Room thermostat state
platform: fourheat
datapoint: J40007
parser: return data[data.size() - 3] == '0';
sensor:
- id: exhaust_temperature
name: Exhaust temperature
platform: fourheat
datapoint: J30005
device_class: temperature
unit_of_measurement: °C
- id: buffer_temperature
name: Buffer temperature
platform: fourheat
datapoint: J30012
device_class: temperature
unit_of_measurement: °C
- id: boiler_temperature
name: Boiler temperature
platform: fourheat
datapoint: J30017
device_class: temperature
unit_of_measurement: °C
- id: water_pressure
name: Water pressure
platform: fourheat
datapoint: J30020
device_class: pressure
unit_of_measurement: mbar
- id: airflow
name: Airflow
icon: "mdi:air-filter"
platform: fourheat
datapoint: J30026
unit_of_measurement: Nr
- id: comb_fan_speed
name: Combustion Fan Speed
icon: "mdi:fan"
platform: fourheat
datapoint: J30025
unit_of_measurement: rpm
- id: room_temperature
name: Room temperature
platform: fourheat
datapoint: J30006
device_class: temperature
unit_of_measurement: °C
number:
- id: boiler_target_temperature
name: Boiler target temperature
platform: fourheat
datapoint: B20199
device_class: temperature
unit_of_measurement: °C
min_value: 5
max_value: 110
- id: buffer_thermostat_threshold
name: Buffer thermostat threshold
platform: fourheat
datapoint: B20241
device_class: temperature
unit_of_measurement: °C
min_value: 1
max_value: 20
- id: buffer_target_temperature
name: Buffer target temperature
platform: fourheat
datapoint: B20225
device_class: temperature
unit_of_measurement: °C
min_value: 20
max_value: 110
I think using the word several was misleading. That’s more than 20 functions. 
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Have you asked a question on leohusar’s GitHub?
how many nuts make a pile
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I have one BT proxy with 7 other functions and it just about manages. It will depend on how much memory is used. Remember you will also be sharing the wifi and Bluetooth on the esp so both will not be running together.
If asked by my wife how many beers I had and I replied several and it was 20 then misleading would not be the word used. 
Cheers
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Yeah when I said go nuts… I mean a couple a few, several… Definitely nothing in double digits.
Spouse: Honey there’s a crate from Amazon on the front porch?
Me: I bought several switches…
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I did. I give here his answer:
"I’m not using any specific C++ version, everything just works for me. But I’m using ESP-IDF framework, so my idea is, maybe it uses C++17?
You can enable C++17 using build flags and it should work, something like this:
esphome:
platformio_options:
build_flags: "-std=gnu++17"
build_unflags: "-std=gnu++11"
I found ESPHome has some custom std::optional reimplementation, but I don’t know if it can do everything I need. When I have some time I might look into it."