Finally got it! Basically I use global variables to store the settings of 2 services (FFF1 and FFF3). They get updated via the sensors (handle 1 and handle 3) so that if you change a setting on the device, it also reflects in home assistant. After changing any setting in home assistant, I update the global variables, and call a script. The script calculates the crc values and sends them to the inkbird controller. Now the next step will be to use a PID integration. Or I might give a custom component in HA a try, so you would not have to use an ESP. Not sure yet 
I did not include all the settings in sensors but they can be done in the same way, using the mapping of bytes in my post above.
esphome:
name: esp32
esp32:
board: esp32dev
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
esp32_ble_tracker:
globals:
- id: isc_blecommand1
type: std::vector<unsigned char>
initial_value: '{0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x32, 0x00, 0x00, 0x00, 0x00, 0x3a, 0x0d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}'
- id: isc_blecommand3
type: std::vector<unsigned char>
initial_value: '{0x00, 0x00, 0x00, 0x64, 0x00, 0x64, 0x00, 0x96, 0x00, 0x4e, 0x02, 0x90, 0xf2, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}'
ble_client:
- mac_address: 49:22:04:02:00:F8
id: isc007bw
on_connect:
then:
- lambda: |-
ESP_LOGD("ble_client_lambda", "Connected to BLE device");
# input number for setting the wanted grill temp for auto fan-mode.
number:
- platform: template
name: "isc_wanted_grill_temp"
device_class: "temperature"
min_value: 0
max_value: 315
step: 1
lambda: return (int)id(isc_blecommand3)[3];
set_action:
- lambda: id(isc_blecommand3)[3] = (uint8_t)x;
- script.execute: isc_command_send
sensor:
- platform: ble_client
type: characteristic
ble_client_id: isc007bw
id: fanspeed
name: "Fan Speed"
service_uuid: 'FFF0' # device service
characteristic_uuid: 'FFF6' # subsciption
notify: true
lambda: |-
uint8_t speed = x[6];
uint16_t temp1 = x[0] | x[1] <<8;
id(isc_probe1).publish_state((float)temp1 /10 );
uint16_t temp2 = x[2] | x[3] <<8;
id(isc_probe2).publish_state((float)temp2 /10 );
uint16_t temp3 = x[4] | x[5] <<8;
id(isc_probe3).publish_state((float)temp3 /10 );
return (float)speed ;
unit_of_measurement: '%'
icon: "mdi:fan"
- platform: ble_client
type: characteristic
ble_client_id: isc007bw
name: "isc handle 1"
service_uuid: 'FFF0' # device service
characteristic_uuid: 'FFF1' # subsciption
update_interval: 60s
lambda: |-
for (int i = 0; i < x.size(); i++) {
id(isc_blecommand1)[i] = (uint8_t)x[i]; }
return (float)x.size();
- platform: ble_client
type: characteristic
ble_client_id: isc007bw
name: "isc handle 3"
service_uuid: 'FFF0' # device service
characteristic_uuid: 'FFF3' # subsciption
update_interval: 60s
lambda: |-
for (int i = 0; i < x.size(); i++) {
id(isc_blecommand3)[i] = (uint8_t)x[i]; }
return (float)x.size();
- platform: template
id: isc_probe1
name: "isc probe 1"
device_class: "temperature"
unit_of_measurement: '°F'
- platform: template
id: isc_probe2
name: "isc probe 2"
device_class: "temperature"
unit_of_measurement: '°F'
- platform: template
id: isc_probe3
name: "isc probe 3"
device_class: "temperature"
unit_of_measurement: '°F'
output:
- platform: template
id: isc_output
type: float
write_action:
- if:
condition:
fan.is_on: isc_fan
then:
- lambda: id(isc_blecommand1)[6] = (uint8_t)id(isc_fan).speed;
- script.execute: isc_command_send
fan:
- platform: speed
id: isc_fan
output: isc_output
speed_count: 100
name: "ISC-007BW fan"
on_turn_on:
- lambda: id(isc_blecommand1)[0] = (uint8_t)1;
- script.execute: isc_command_send
- logger.log: "Fan turned on"
on_turn_off:
- lambda: id(isc_blecommand1)[0] = (uint8_t)0;
- script.execute: isc_command_send
- logger.log: "Fan turned off"
on_speed_set:
- logger.log: "Fan Speed was changed!"
select:
- platform: template
name: "BBQ type"
id: "isc_bbq_select"
lambda: |-
auto index = int(id(isc_blecommand1)[7]);
auto val = id(isc_bbq_select).at(index);
return {val};
options:
- "Kamado 22"
- "Kamado 15"
- "Kettle 22"
- "Kettle 15"
- "WSM 18"
set_action:
- lambda: |-
if (x == "Kamado 22") {
id(isc_blecommand1)[7]=(uint8_t)0;}
if (x == "Kamado 18") {
id(isc_blecommand1)[7]=(uint8_t)1;}
if (x == "Kettle 22") {
id(isc_blecommand1)[7]=(uint8_t)2;}
if (x == "Kettle 15") {
id(isc_blecommand1)[7]=(uint8_t)3;}
if (x == "WSM 18") {
id(isc_blecommand1)[7]=(uint8_t)4;}
id(isc_bbq_select).publish_state(x);
- script.execute: isc_command_send
switch:
- platform: ble_client
ble_client_id: isc007bw
name: "ISC-007BW"
id: isc007bwswitch
- platform: template
name: "Fan BBQ auto"
id: "isc_auto_fan_switch"
lambda: |-
return id(isc_blecommand1)[1];
turn_on_action:
- lambda: id(isc_blecommand1)[1] = 0x01;
- script.execute: isc_command_send
turn_off_action:
- lambda: id(isc_blecommand1)[1] = 0x00;
- script.execute: isc_command_send
script:
- id: isc_command_send
then:
- lambda: |-
uint16_t crc = 0xFFFF;
// Calculate CRC for the first 11 bytes
for (int pos = 0; pos < 11; pos++) {
crc = crc ^ (uint16_t)(id(isc_blecommand1)[pos] );
for (int i = 8; i != 0; i--) {
if ((crc & 0x0001) != 0) {
crc >>= 1;
crc ^= 0xA001;
}
else // Else LSB is not set
crc >>= 1; // Just shift right
}
}
id(isc_blecommand1)[11] = crc & 0xFF; // little endian
id(isc_blecommand1)[12] = (crc >> 8) & 0xFF; // little endian
- ble_client.ble_write:
id: isc007bw
service_uuid: FFF0
characteristic_uuid: FFF1
value: !lambda 'return id(isc_blecommand1);'
- lambda: |-
uint16_t crc = 0xFFFF;
// Calculate CRC for the first 11 bytes
for (int pos = 0; pos < 11; pos++) {
crc = crc ^ (uint16_t)(id(isc_blecommand3)[pos] );
for (int i = 8; i != 0; i--) {
if ((crc & 0x0001) != 0) {
crc >>= 1;
crc ^= 0xA001;
}
else // Else LSB is not set
crc >>= 1; // Just shift right
}
}
id(isc_blecommand3)[11] = crc & 0xFF; // little endian
id(isc_blecommand3)[12] = (crc >> 8) & 0xFF; // little endian
- ble_client.ble_write:
id: isc007bw
service_uuid: FFF0
characteristic_uuid: FFF3
value: !lambda 'return id(isc_blecommand3);'