Makes ble_client.ble_write's action value templatable (#3715)

esphome/components/ble_client/__init__.py

@@ -82,7 +82,7 @@ BLE_WRITE_ACTION_SCHEMA = cv.Schema(
         cv.Required(CONF_ID): cv.use_id(BLEClient),
         cv.Required(CONF_SERVICE_UUID): esp32_ble_tracker.bt_uuid,
         cv.Required(CONF_CHARACTERISTIC_UUID): esp32_ble_tracker.bt_uuid,
-        cv.Required(CONF_VALUE): cv.ensure_list(cv.hex_uint8_t),
+        cv.Required(CONF_VALUE): cv.templatable(cv.ensure_list(cv.hex_uint8_t)),
     }
 )
 
@@ -93,8 +93,14 @@ BLE_WRITE_ACTION_SCHEMA = cv.Schema(
 async def ble_write_to_code(config, action_id, template_arg, args):
     paren = await cg.get_variable(config[CONF_ID])
     var = cg.new_Pvariable(action_id, template_arg, paren)
+
     value = config[CONF_VALUE]
-    cg.add(var.set_value(value))
+    if cg.is_template(value):
+        templ = await cg.templatable(value, args, cg.std_vector.template(cg.uint8))
+        cg.add(var.set_value_template(templ))
+    else:
+        cg.add(var.set_value_simple(value))
+
     serv_uuid128 = esp32_ble_tracker.as_reversed_hex_array(config[CONF_SERVICE_UUID])
     cg.add(var.set_service_uuid128(serv_uuid128))
     char_uuid128 = esp32_ble_tracker.as_reversed_hex_array(

esphome/components/ble_client/automation.cpp

@@ -10,7 +10,7 @@ namespace esphome {
 namespace ble_client {
 static const char *const TAG = "ble_client.automation";
 
-void BLEWriterClientNode::write() {
+void BLEWriterClientNode::write(const std::vector<uint8_t> &value) {
   if (this->node_state != espbt::ClientState::ESTABLISHED) {
     ESP_LOGW(TAG, "Cannot write to BLE characteristic - not connected");
     return;
@@ -29,9 +29,10 @@ void BLEWriterClientNode::write() {
     ESP_LOGE(TAG, "Characteristic %s does not allow writing", this->char_uuid_.to_string().c_str());
     return;
   }
-  ESP_LOGVV(TAG, "Will write %d bytes: %s", this->value_.size(), format_hex_pretty(this->value_).c_str());
-  esp_err_t err = esp_ble_gattc_write_char(this->parent()->gattc_if, this->parent()->conn_id, this->ble_char_handle_,
-                                           value_.size(), value_.data(), write_type, ESP_GATT_AUTH_REQ_NONE);
+  ESP_LOGVV(TAG, "Will write %d bytes: %s", value.size(), format_hex_pretty(value).c_str());
+  esp_err_t err =
+      esp_ble_gattc_write_char(this->parent()->gattc_if, this->parent()->conn_id, this->ble_char_handle_, value.size(),
+                               const_cast<uint8_t *>(value.data()), write_type, ESP_GATT_AUTH_REQ_NONE);
   if (err != ESP_OK) {
     ESP_LOGE(TAG, "Error writing to characteristic: %s!", esp_err_to_name(err));
   }

esphome/components/ble_client/automation.h

@@ -42,10 +42,8 @@ class BLEWriterClientNode : public BLEClientNode {
     ble_client_ = ble_client;
   }
 
-  void set_value(std::vector<uint8_t> value) { value_ = std::move(value); }
-
-  // Attempts to write the contents of value_ to char_uuid_.
-  void write();
+  // Attempts to write the contents of value to char_uuid_.
+  void write(const std::vector<uint8_t> &value);
 
   void set_char_uuid128(uint8_t *uuid) { this->char_uuid_ = espbt::ESPBTUUID::from_raw(uuid); }
 
@@ -60,14 +58,34 @@ class BLEWriterClientNode : public BLEClientNode {
   esp_gatt_char_prop_t char_props_;
   espbt::ESPBTUUID service_uuid_;
   espbt::ESPBTUUID char_uuid_;
-  std::vector<uint8_t> value_;
 };
 
 template<typename... Ts> class BLEClientWriteAction : public Action<Ts...>, public BLEWriterClientNode {
  public:
   BLEClientWriteAction(BLEClient *ble_client) : BLEWriterClientNode(ble_client) {}
 
-  void play(Ts... x) override { return write(); }
+  void play(Ts... x) override {
+    if (has_simple_value_) {
+      return write(this->value_simple_);
+    } else {
+      return write(this->value_template_(x...));
+    }
+  }
+
+  void set_value_template(std::function<std::vector<uint8_t>(Ts...)> func) {
+    this->value_template_ = std::move(func);
+    has_simple_value_ = false;
+  }
+
+  void set_value_simple(const std::vector<uint8_t> &value) {
+    this->value_simple_ = value;
+    has_simple_value_ = true;
+  }
+
+ private:
+  bool has_simple_value_ = true;
+  std::vector<uint8_t> value_simple_;
+  std::function<std::vector<uint8_t>(Ts...)> value_template_{};
 };
 
 }  // namespace ble_client

tests/test2.yaml

@@ -615,3 +615,9 @@ switch:
           service_uuid: F61E3BE9-2826-A81B-970A-4D4DECFABBAE
           characteristic_uuid: 6490FAFE-0734-732C-8705-91B653A081FC
           value: [0x01, 0xab, 0xff]
+      - ble_client.ble_write:
+          id: airthings01
+          service_uuid: F61E3BE9-2826-A81B-970A-4D4DECFABBAE
+          characteristic_uuid: 6490FAFE-0734-732C-8705-91B653A081FC
+          value: !lambda |-
+            return {0x13, 0x37};